The law of conservation states that:

How do nutrients cycle through the biosphere?

A chemical substance that an organism needs to perform life processes is called?

The combination of processes that exchange matter through the biosphere is called?

Which statement is not a step in the water cycle?

Autotrophs and heterotrophs release carbon dioxide into the air during:

Nitrogen is returned to the soil when-

Growth of producers is limited by-

Who begins the nutrient cycle through the biosphere?

At each step in the food web, organisms reuse __________ to make proteins.

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