Cars and industry burning fossil fuels is an example of ____ that releases ____ into the air.

• Respiration; CO2

• Combustion; O2

• Transpiration; O2

• Combustion; CO2

The release of water vapor from plants is called

• combustion

• transpiration

• evaporation

• condensation

Matter cannot be created nor destroyed, it is converted from one form to another form is known as

• The Law of Conservation of Matter

• The Law of Saving the Ecosystem

• The Law of Conservation of Energy

• The Principle of Ecosystem Change

The remains of ancient plants and animals that have been pressurized and buried for millions of years can be mined as

• limestone.

• calcium carbonate.

• wood.

• fossil fuels.

Denitrifying bacteria are responsible for changing

• N2 gas into ammonia

• N2 gas into nitrates

• proteins and DNA into ammonia

• ammonia and nitrates into N2 gas

Most of the nitrogen found on earth is in

• living things

• the ocean

• the atmosphere

• buried in rocks

Legume plants are

• any green plant that does photosynthesis

• bean plants that contain nodules of bacteria on their roots

• an important plant in the water cycle

• plants that have become part of our fossil fuels

Non-legume plants can only use nitrogen in the form of

• N2 gas

• ammonia (NH3)

• nitrates (NO3)

• they can use any of these

The strong triple bond between N-N molecules can be broken by all of the following except

• lightning

• a chemical process used to make fertilizer

• nitrifying bacteria

• wearing down of rocks to create sand

Phosphorus is important in living cells to make

• carbohydrates

• proteins

• DNA and RNA

• storage vacuoles