What trophic level is a maple tree?

Where does all food energy come from?

What are primary consumers?

Which are examples of nonliving elements of an ecosystem?

Which is not an example of interaction in an ecosystem?

Bacteria are an important part of a food web because

The organisms below are all decomposers except

Why are there fewer tertiary consumers than producers in an ecosystem?

What is a symbiotic relationship?

What happens if some of the top consumers are removed from an ecosystem, like the wolves in Yellow Stone?

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