Human Impact

What converts nitrogen gas into a usable form for plants and animals?

• bacteria

• rain

• fungi

• car exhaust

Gas that makes up 78% of our atmosphere.

• Oxygen

• Nitrogen

• Hydrogen

• Carbon Dioxide

What is the formula for atmospheric nitrogen?

• N

• N₂

• NH₃

• NO₃

Plants and animals cannot use nitrogen directly from the air.

• True

• False

According to this diagram, plants use nitrogen to make _________________________

• bacteria

• animals

• proteins

• decomposers

What process occurs when coal (fossil fuel) is used for energy?

• Decomposition
• Combustion
• Pressurization 
• Respiration 

1. Which biome has the highest biodiversity and is the most threatened?

• Temperate forests

• grasslands

• tropical rain forests

• deserts

According to the graph, what material’s recycling would reduce the largest portion of America’s trash?

• Metals

• paper

• plastics

• Yard trimmings

If a species in no longer found living on Earth it is

• pollutants

• extinct

• species

• endangered

An endangered species is

• One whose numbers are so small that it is at risk of extinction
  
• One whose not been spotted after many years.
• One whose numbers are abundant.