Where do animals get nitrogen?
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1 point
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from the soil
from the air
from their food
from the water they drink and swim in
In this food chain, how would you classify plants?
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1 point
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herbivore
primary consumer
omnivore
primary producer
Check ALL that are correct.
How do humans influence cycles of matter?
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1 point
water withdrawn from lakes and streams
clear vegetation (forests and other plants) ~ deforestation
burning fossil fuels and wood
runoff of animal waste, fertilizer, and sewage into surface water
fill in wetlands
None of these
In the energy pyramid, which organisms have the least amount of energy available to them?
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1 point
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Producers
Carnivores
Herbivores
Apex or Top Predator