What is the water cycle?

What are the three main reservoirs of the oxygen cycle?

What removes oxygen from the air?

What is the global carbon budget?

What do you call the predictable changes in the composition or structure of an ecological community?

What is biodiversity an indicator of?

Which of the following is a biotic factor of an ecosystem?

Ecosystems have to have two factors working together in order to function. What are those two factors?

What do decomposers do in an ecosystem?

Ten percent of energy is transferred from one level to the next level on the energy pyramid. What happens to the other 90% of energy?

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