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Science Final Exam REVIEW GAME (2022*)

Total questions: 145

Worksheet time: 2hrs 41mins

Name
Class
Date
1.
Which of these items converts electrical energy to heat energy? 
a)
refrigerator
b)
shower
c)
hair dryer
d)
calculator
2.

The Law of Conservation of Energy states:

a)

Energy can be created or destroyed but not transformed

b)

Energy cannot be created or destroyed, it can only be transformed

c)

Energy can't be created, destroyed or transformed

d)

Energy only exists on Earth

3.

Which of the methods of generating electricity does NOT use renewable energy resources?

a)

Burning coal in a power plant

b)

Turbines spinning in dam

c)

Solar panels taking in light energy

d)

Drilling wells to reach heat deep inside the earth

4.
Energy transformations occur when...
a)
energy is created through conduction
b)
energy changes from one form to another
c)
two forces slide together that are touching
d)
a chemical reaction takes place
5.
The roller coaster cart has the most gravitational potential energy at position-
a)
W
b)
X
c)
Y
d)
Z
6.
Why is solar energy considered renewable energy?
a)
It's cheaper than fossil fuels
b)
The sun's energy would not run out for billions of years
c)
Solar energy recharges batteries
d)
All of them
7.

Renewable energy resources produce less_____________ than fossil fuels.

a)

pollution

b)

energy

c)

wind

d)

light

8.

What is a renewable resource?

a)

A resource you can reuse over and over

b)

An object you cannot replace

c)

Fossil fuels

d)

A resource that has a nearly unlimited supply

9.
Energy produced by burning organic matter such as wood, food scraps, and animal matter is called______________ energy.
a)
Biomass
b)
Thermal energy
c)
Solar
d)
Wind
10.

All of the following are considered renewable energy sources EXCEPT –

a)

Wind

b)

Coal

c)

Biomass

d)

Solar

11.
The ultimate source of energy is:
a)
The sky
b)
The sun
c)
Plants
d)
Movement
12.
Kinetic Energy is:
a)
the energy of motion
b)
always conserved
c)
stored energy
d)
not a form of energy
13.
What kind of energy is represented in the picture?
a)
Thermal
b)
Chemical
c)
Sound
d)
Nuclear
14.
What kind(s) of energy are involved when a television is working? 
a)
light only
b)
light and heat only
c)
electricity only
d)
electrictiy, light, heat, and sound
15.
The ability to do work is the definition for which word
a)
chemical energy
b)
mechanical energy
c)
Energy
d)
produce
16.
One problem with ___________ energy is that it produces radioactive waste. 
a)
nuclear
b)
solar
c)
tidal
d)
wind
17.
Which is NOT an example of Biomass?
a)
wood
b)
old plants
c)
wind
d)
animal and yard waste
18.
Which is the best example that something has kinetic energy?
a)
a. a car parked on a steep hill 
b)
b. a tennis ball rolling across the court
c)
c. a picture hanging on the wall 
d)
d. a piece of coal before it's burned 
19.
The energy of HEAT is known as _______ energy
a)
thermal
b)
chemical
c)
mechanical
d)
kinetic
20.

This form of energy takes millions of year to be created and it is created from the remains of dead plants and animals.

a)

fossil fuels

b)

renewable energy

c)

radiant energy

d)

work

21.

nonrenewable resource

a)

these forms of energy cannot be easily replaced

b)

these forms of energy can be easily replaced

c)

these forms of energy do not exist

d)

these forms of energy include only kinetic forms of energy

22.

another name for light energy is...

a)

radiant energy

b)

conduction

c)

convection

d)

power

23.

What are the main fossil fuels?

a)

Coal

b)

Oil

c)

Natural Gas

d)

Nuclear Energy

24.

Nuclear Energy is made through 2 processes called...

a)

Fission

b)

Fusion

c)

Fracking

d)

Heating

25.

Which fossil fuel is created from the remains of dead plants and forms into a "rock?"

a)

Coal

b)

Petroleum

c)

Natural Gas

d)

Nuclear Energy

26.

What is the main element in fossil fuels?

a)

Carbon

b)

Oxygen

c)

Methane

d)

Uranium

27.

In the United States, what percent (%) of our energy comes from fossil fuels?

a)

85%

b)

30%

c)

75%

d)

99%

28.

In order to use the energy inside of fossil fuels, they must be...

a)

burned

b)

melted

c)

crushed

d)

cut

29.

What is needed for all fossil fuels to form?

a)

Heat

b)

Pressure

c)

A lot of time

d)

All of these

30.

What type of energy is in this picture?

a)

Gravitational Potential Energy

b)

Elastic Potential Energy

c)

Elastic Kinetic Energy

d)

Kinetic Sound Energy

31.

A ball sitting on a table is an example of what type of energy?

a)

Kinetic

b)

Potential

c)

Electrical

d)

Radiant

32.

Sunlight warming Earth is an example of...

a)

Creation of energy

b)

Transfer of energy

c)

Loss of energy

d)

Destroying energy

33.

A battery powered clock is an example of...

a)

thermal energy

b)

chemical energy

c)

radiant energy

d)

gravitational energy

34.

The strings on a guitar are an example of...

a)

Gravitational kinetic energy

b)

Elastic kinetic energy

c)

Elastic potential energy

d)

Gravitational potential energy

35.

Identify the correct energy transformation for a bonfire burning:

a)

Chemical --> Radiant --> Thermal

b)

Kinetic --> Potential --> Kinetic --> Sound

c)

Sound --> Electrical --> Thermal

d)

Electrical --> Sound --> Thermal

36.

Which statement about fossil fuels is true?

a)

fossil fuels are non-renewable resources

b)

fossil fuels do not create pollution when burned

c)

fossil fuels are renewable resources

d)

fossil fuels form very rapidly (quickly)

37.
The Law of Conservation of Energy states:
a)
Energy can created or destroyed but not transformed 
b)
Energy cannot be created or destroyed, it can only transformed
c)
Energy can't be created, destroyed or transformed
38.
_____________ power is electricity produced by flowing water.
a)
Solar 
b)
Wind 
c)
Hydroelectric 
d)
water
39.
This power plant produces electricity most likely by using - 
a)
fossil fuels
b)
biofuels
c)
solar energy 
d)
geothermal energy 
40.

Renewable Resources are the SAME as ...

a)

Non-Renewable Resources

b)

Green Energy

41.
What characteristic do all renewable resources share?
a)
Produced by waste products
b)
Form underground from dead organisms.
c)
Replaced in a short period of time
d)
Allow energy to pass through them easily
42.

Fossil fuels are considered nonrenewable because they

a)

do not produce pollution

b)

are no longer used by humans

c)

are created so quickly

d)

take millions of years to form, so once they're gone, they're gone

43.

A disadvantage of nuclear energy is that it creates...

a)

fossil fuels

b)

hydroelectric

c)

radioactive waste

d)

biomass

44.
What country did the Fukushima accident occur?
a)
France
b)
India
c)
China
d)
Japan
45.

Fission is the process of

a)

combining atoms to form new atoms

b)

splitting atoms to make smaller atoms

c)

Breaking atoms down

d)

Destroying atoms

46.
Layer of Earth's atmosphere where it rains
a)
thermosphere
b)
mesosphere
c)
stratosphere
d)
troposphere
47.
Layer of Earth's atmosphere in which we live
a)
thermosphere
b)
mesosphere
c)
stratosphere
d)
troposphere
48.

Earth's ozone layer is important because it absorbs

a)

visible light

b)

harmful ultraviolet radiation (UV light)

c)

x-rays

d)

radio waves

49.
Warm air rises and creates
a)
low pressure
b)
medium pressure
c)
high pressure
d)
uneven pressure
50.
Cold air sinks and creates
a)
low pressure
b)
medium pressure
c)
high pressure
d)
uneven pressure
51.

Which pressure system results in rainy or stormy weather?

a)

weather system

b)

high pressure

c)

low pressure

d)

jet stream

52.
Which front is represented on a weather map with the following symbol?
a)
cold
b)
stationary
c)
warm
d)
occluded
53.
Which front is represented on a weather map with the following symbol?
a)
cold
b)
stationary
c)
warm
d)
occluded
54.
______ is the average pattern for weather over a long period of time.
a)
climate
b)
weather
c)
forecast
d)
sunlight
55.
Weather associated with high pressure is generally
a)
cloudy but dry
b)
unpreditable
c)
wet and cloudy
d)
dry and clear
56.

APPROXIMATELY what percentage of Earth's surface is covered by oceans?

a)

40%

b)

50%

c)

60%

d)

70%

57.

In the past, refrigerators, aerosol spray propellants and cleaning solvents were all sources of a greenhouse gas known as ________ and they put a hole in the ozone layer.

a)

carbon dioxide

b)

methane

c)

chlorofluorocarbon (CFC)

d)

nitrous oxide

58.

Air pressure differences cause _____________ to form.

a)

tides

b)

salinity

c)

wind

d)

none of the others

59.

_________ is the most abundant (common) gas in our atmosphere

a)

oxygen

b)

nitrogen

c)

carbon dioxide

d)

methane

60.

A(n) _______________ front results in a quick drop in temperature, strong winds, and precipitation

a)

stationary

b)

occluded

c)

warm

d)

cold

61.

Identify the 2 main gases in Earth's atmosphere

a)

Nitrogen

b)

Oxygen

c)

Methane

d)

Carbon Dioxide

62.
A front is
a)
where warm air is cooling at earth's surface
b)
a line where hot and cold air are separating
c)
a line where two different air masses meet
d)
where cold air is rising and forming rain clouds
63.

What gas makes up 21% of Earth's Atmosphere?

a)

Nitrogen

b)

Oxygen

c)

Ozone

d)

None of the Above

64.

Where do satellites orbit?

a)

Thermosphere

b)

Stratosphere

c)

Exosphere

d)

Mesosphere

65.

What is the correct order of layers for the atmosphere from Earth's surface to outer space?

a)

Thermosphere

Stratosphere

Mesosphere

Troposphere

Exosphere

b)

Thermosphere

Exosphere

Troposphere

Mesosphere

Stratosphere

c)

Troposphere

Stratosphere

Mesosphere

Thermosphere

Exosphere

d)

Troposphere

Stratosphere

Exosphere

Thermosphere

Mesosphere

66.

What is the energy source for the water cycle?

a)

the sun

b)

the earth

c)

clouds

d)

the moon

67.

Which of the following best describes climate?

a)

day to day conditions of the atmosphere at a place in regards to heat, dryness, sunshine, wind, rain, etc.

b)

long-term conditions (months/years) of the atmosphere at a place in regards to heat, dryness, sunshine, wind, rain, etc.

68.

Which of the following best describes weather?

a)

day to day conditions of the atmosphere at a place in regards to heat, dryness, sunshine, wind, rain, etc.

b)

long-term conditions (months/years) of the atmosphere at a place in regards to heat, dryness, sunshine, wind, rain, etc.

69.

Which pressure system results in rainy or stormy weather?

a)

weather system

b)

high pressure

c)

low pressure

d)

jet stream

70.
a)

cold front

b)

warm front

c)

stationary front

d)

low pressure

71.
a)

cold front

b)

warm front

c)

stationary front

d)

high pressure

72.
a)

cold front

b)

warm front

c)

stationary front

d)

high pressure

73.
a)

cold front

b)

warm front

c)

stationary front

d)

low pressure

74.
a)

cold front

b)

warm front

c)

stationary front

d)

low pressure

75.

This type of front is "stuck" and rain may happen for many days

a)

cold front

b)

warm front

c)

high front

d)

stationary front

76.

What weather did Seattle just experience?

a)

cooler temperatures and a thunderstorm because of the cold front that just passed through

b)

cooler temperatures and light rain because of the low pressure system that just passed through

c)

warmer temperatures because of the warm front that just passed through

d)

no precipitation and a drop in temperature because of the cold front that just passed through

77.

If a high pressure system is expected to move across Ohio tomorrow, what kind of weather could we expect?

a)

Wet

b)

Stormy

c)

Sunny

d)

Windy

78.
What direction is the warm front moving on the map? 
a)
North
b)
South
c)
East
d)
West
79.

Bob and Ann want to know if today has a higher or low air pressure system. Outside they notice that the atmosphere is cool and dry. This means they are experiencing a…

a)

High pressure system

b)

Low pressure system

c)

Both a high and low pressure system

d)

Neither a high & low pressure system

80.

On a cold, cloudy day, the local weather forecaster predicts that a high-pressure system will be moving into the area in the next 24 hours. Which weather conditions will this system most likely bring to the area?

a)

stormy

b)

sunny

c)

snowy

d)

hot

81.

What is the forecast going to be in Dallas?

a)

Sunny skies

b)

Rain showers

c)

Snow Flurries

d)

Hurricane

82.

What is the forecast going to be in Minneapolis?

a)

Sunny skies

b)

Rain showers

c)

Snow Flurries

d)

Hurricane

83.

What is the forecast going to be in Los Angeles?

a)

Sunny skies

b)

Rain showers

c)

Snow Flurries

d)

Hurricane

84.

The high temperature for Dallas, Texas today was 56 degrees F. Tomorrow's high temperature is forecasted to be 69 degrees F with possible rain showers. What inference can be made?

a)

Dallas is experiencing a low pressure system.

b)

A stationary front will pass through the area.

c)

A high pressure system will pass through Dallas.

d)

A cold front is approaching the area and will decrease temperatures.

85.

Over the last decade we have had an increase in the amount of rain in our area.

a)

weather

b)

climate

86.

Which of the following gases, released by cattle livestock as a waste product of digestion, can add to global warming? Hint: It does the most damage compared to other greenhouse gases.

a)

Carbon Dioxide

b)

Methane

c)

Chlorofluorocarbon

d)

Nitrogen

87.

Too many greenhouse gasses in the atmosphere may block heat from escaping into space and trap too much heat next to the Earth’s surface causing: ____________.

a)

another ice age

b)

global warming

c)

earthquakes

d)

volcanic eruptions

88.

Something that might happen because of global warming is: __________.

a)

melting polar ice caps

b)

more reflected sunlight off the ice pack

c)

lower sea levels

d)

a sale on bathing suits

89.

Over the past 200 years, the level of carbon dioxide in the atmosphere has

a)

decreased slightly.

b)

increased until recently, and then decreased.

c)

increased steadily.

d)

stayed about the same.

90.

The greenhouse effect is

a)

the absorption of energy by clouds.

b)

a gradual increase in the temperature of the atmosphere.

c)

the use of solar panels to create energy in greenhouses

d)

the process by which gases hold heat in the atmosphere.

91.

Which of the following is NOT a greenhouse gas?

a)

Oxygen (O2)

b)

Carbon Dioxide

c)

Methane

d)

Nitrous Oxide

92.
What does this diagram illustrate?
a)
Ozone Layer
b)
The Greenhouse Effect
c)
Ultraviolet Radiation
d)
Layers of the atmosphere
93.

Do we need greenhouse gases on Earth?

a)

Yes - they keep the Earth warm

b)

Yes - they get rid of all harmful gases on our planet

c)

No - they only cause terrible climate change

d)

No - they only block some of the Sun's rays

94.

Which of the following human activities contribute to an increased green house effect?

a)

Harvesting energy from the sun.

b)

Deforestation (cutting down trees)

c)

Walking to work.

d)

Switching to solar powered electricity

95.

Which of the following NATURAL events would be most likely to contribute to changing Earth's climate?

a)

Earthquake

b)

Hurricane

c)

Volcanoes Errupting

d)

Monsoon

96.

What do humans do that releases greenhouse gases into the atmosphere?

a)

Burn fossil fuels

b)

Use wind energy

c)

Ride bikes

d)

Planting trees

97.

Which of the following can ADD carbon to the atmosphere?

a)

the sun shining

b)

deforestation

c)

evaporation

d)

burning fossil fuels

98.

Which of the following gases DOES NOT trap heat?

a)

carbon dioxide

b)

nitrogen

c)

water vapor

d)

methane

99.

Things you can do to help decrease global warming include:

a)

Eat more meat

b)

Keep your thermostat high, keeping your house as warm as possible

c)

Keep your air conditioner on high

d)

Turn off your lights when you’re not using them

100.

What is the biggest danger posed by global warming to people living in coastal areas (near water)?

a)

increased precipitation

b)

increased acidity of sea water

c)

lack of carbon dioxide in the atmosphere

d)

rising sea level

101.

Climate can change everyday.

a)

True - climate can and does change every day

b)

False - climate changes over long periods of time

c)

False - climate only changes once every 100 years

d)

False - climate changes as fast as weather changes

102.

Which of the following have been linked to climate change?

a)

droughts

b)

flooding

c)

melting of polar ice caps

d)

less sunshine

103.
______ is the average pattern for weather over a long period of time.
a)
climate
b)
weather
c)
forecast
d)
sunlight
104.

Which of the following human activities contributes the MOST carbon dioxide to our atmosphere?

a)

using electricity

b)

driving cars

c)

using solar energy

d)

becoming a vegetarian and not eating meat

105.

Why are too many greenhouse gases bad for the environment?

a)

They cause trees to die.

b)

They release heat and will be the cause of the next ice age.

c)

They trap heat in our atmosphere causing the planet to warm up.

d)

They are fossil fuels which pollute our environment.

106.

Oil, gasoline and coal are all examples of this type of fuel.

a)

natural gases

b)

fossil fuels

c)

alternative fuels

d)

bio-fuels

107.

Choose all of the following which are examples of climate and not just weather?

a)

The high temperature tomorrow will be 47 degrees.

b)

It snowed 2 inches in Ann Arbor today.

c)

The average rainfall during Spring in Michigan is 14 inches.

d)

The temperature in Michigan in the month of May ranges from 73 degrees to 91 degrees Fahrenheit.

108.

Which of the following is a consequence of global warming? (Choose all that apply)

a)

Seas rising (flooding)

b)

Loss of habitat for animals.

c)

More severe storms and weather.

d)

Increased forest fires and drought.

109.

Due to the changing climate, places like Australia and California are going to experience longer periods of ________ in which these areas lack water.

a)

drought

b)

rain

c)

hurricanes

d)

tornadoes

110.

Ice caps _______ light from the sun, whereas the ocean does the opposite because it is darker in color.

a)

reflect

b)

absorb

c)

break apart

d)

dissolve

111.

This greenhouse gas is the most abundant in our atmosphere

a)

methane

b)

water vapor

c)

carbon dioxide

d)

climate

112.

Which one of the choices below is NOT a cause for global warming?

a)

Having too many cows

b)

Burning Fossil Fuels

c)

Planting new trees

d)

A car running off of gasoline

113.

Why does cutting down trees increase global warming?

a)

trees soak up carbon dioxide

b)

trees provide shade which counteracts global warming

c)

trees absorbs the sun's energy without radiating back into the atmosphere

d)

trees drain greenhouse gases like oxygen from soil

114.

What happens to the temperature if more greenhouse gases are released into the atmosphere?

a)

Temperature goes up

b)

Temperature goes down

c)

Temperatures stay the same

d)

Temperature isn't connected to carbon dioxide

115.

Without the Greenhouse Effect the Earth would be too

a)

warm

b)

cold

c)

blue

d)

funny

116.

Global warming and climate change are exactly the same.

a)

True

b)

False - global warming can cause climate change

c)

False - climate change can cause global warming

d)

False - climate change and global warming are not real phenomenons

117.

Burning fossil fuels is one of the main causes for global warming.

a)

True - it puts a lot of carbon dioxide into the atmosphere

b)

False

c)

True - it puts a lot of water vapor into the atmosphere

d)

True - it puts a lot of CFC's into the atmosphere

118.

Earth’s climate system is powered mainly by energy from:

a)

Earth's Tilt

b)

The sun

c)

Latitude Energy

d)

The rain shadow

119.

It was hot all week last week. Is this a sign of climate change?

a)

Yes

b)

No

120.

How is the greenhouse effect produced?

a)

When solar energy trespasses the atmosphere then leaves and goes back to space.

b)

When some solar energy is reflected back to earth and gets trapped here by greenhouse gases.

c)

When the green house is burned.

d)

When the sun doesn't emit radiation.

121.

The Earth acts like a _____________ that catches and traps __________ from the sun.

a)

greenhouse; heat

b)

global warming; heat

c)

net; greenhouse effect

d)

greenhouse gas; cold

122.

What is the point of the paint under the eyes?

a)

It absorbs light, allowing the player to see more clearly.

b)

It reflects light, allowing the player to see more clearly.

c)

It absorbs light, making it more difficult for the player to see.

d)

It reflects light, making it more difficult for the player to see.

123.

Cloud cover ________ radiant (light) energy.

a)

reflects

b)

absorbs

c)

breaks down

d)

catches

124.

How can a volcano impact temperatures of the planet?

a)

Gases are released into the atmosphere and these can act like a curtain, blocking out sunlight, cooling the planet.

b)

Gases are released into the atmosphere and these can act like a curtain, absorbing sunlight, warming the planet.

c)

Gases are released into the atmosphere and these don't impact temperature at all.

d)

Volcanoes do not impact temperatures at all when they erupt.

125.

What is climate feedback?

a)

In a climate system, one change can lead to another, and another, and another... etc.

b)

In a climate system, feedback is provided to tell the climate how it is doing.

c)

Scientists collect data in order to change the climate

d)

Changes in climate stop any new changes from happening

126.
Which of the following is the best conclusion that can be made from this graph?
a)
atmospheric carbon dioxide levels have been decreasing since 1960
b)
Hawaii has a lot of carbon dioxide
c)
humans have been working hard to decrease carbon dioxide levels
d)
atmospheric carbon dioxide levels have increased steadily since 1960
127.

How does the concentration of carbon dioxide in the atmosphere affect temperature?

a)

As carbon dioxide concentrations increase, temperatures increase

b)

As carbon dioxide concentration increase, temperatures decrease.

c)

Carbon dioxide concentrations have no affect on climate

d)

As carbon dioxide concentrations increase, temperatures become more random.

128.

Climate change causes extreme weather conditions such as:

a)

Flooding

b)

Heat Waves

c)

Hurricanes

d)

Drought

129.

Possible human solutions for limiting global warming and climate change are...

a)

biking or walking instead of driving

b)

using renewable sources of energy

c)

removing carbon from fossil fuel emissions

d)

throwing away more trash

130.
Why does cutting down trees increase global warming?
a)
trees soak up carbon dioxide
b)
trees provide shade which counteracts global warming
c)
trees absorbs the sun's energy without radiating back into the atmosphere
d)
trees drain greenhouse gases like methane from soil
131.

The average temperature of the surface of Earth has increased approximately 2°F in the past century. Which reason best explains this increase in temperature?

a)

lower levels of ozone in the atmosphere

b)

lower levels of nitrogen in the atmosphere

c)

higher levels of carbon dioxide in the atmosphere

d)

higher levels of oxygen in the atmosphere

132.

Climatologists get clues about the climate of the past by studying what? There is more than one answer.

a)

Rocks

b)

Fossils

c)

TikTok

d)

Glaciers

133.

True or False: Climate on Earth never changes

a)

True

b)

False

134.

Earth is currently experiencing

a)

a warming trend

b)

a period of unchanging climate

c)

a cooling trend

d)

an ice age

135.

What are some signs of climate change? Choose all signs on the list.

a)

change in rain and snow patterns

b)

lowering ocean levels

c)

more precipitation overall

d)

weaker storms

136.

All global warming is bad.

a)

True - We don't want to be too hot.

b)

False - If we didn't have some global warming, the Earth would be too cold to live on.

137.

Where do fossil fuels come from?

a)

The carbon dioxide released from cars.

b)

The remains of plants and animals that died long ago.

c)

Heat from the greenhouse effect.

138.
 When ocean temperatures rise, _______________ rises as well due to _________ melting.
a)
water level, snow
b)
ice level, ice
c)
sea level, glaciers
d)
land level, ice
139.
The greenhouse gas having the greatest role in human-caused global warming is
a)
methane
b)
carbon dioxide
c)
CFCs (chlorofluorocarbons)
d)
ozone
140.
Human activity is adding additional greenhouse gases to the amount that are in the atmosphere naturally
a)
True
b)
False
141.
Why is the increase of Greenhouse gasses a big issue?
a)
It causes climate change and increase in the global temerature 
b)
It can lead to a major increase in Greenhouses 
c)
It leads to more factories
d)
It causes a major decrease in people
142.
Which one of the choices below is NOT a  cause for global warming?
a)
Having too many cows
b)
Burning Fossil Fuels
c)
Planting new trees
143.

Which two are likely to result from global warming?

a)

increase in surface temperatures

b)

reduction in greenhouse gases

c)

rise in ocean levels

d)

decrease in air pollution

144.

Which TWO activities produce the greatest amount of greenhouse gases?

a)

Deforestation

b)

Electricity generation

c)

Transportation

d)

Landfills

145.

Which best explains how livestock farming contributes to global warming ? Animals __________

a)

waste pollutes the soil

b)

are consuming too much grass

c)

decayed matter emits too much carbon dioxide

d)

produce methane when they are digesting food