What is permafrost?

Name three process that release carbon dioxide into the air.

Where does most of the precipitation fall to the Earth?

Choose the example of an abiotic factor changing an environment.

What process causes carbon to become part of living organisms?

How do wetlands replenish groundwater?

What must happen to nitrogen gas before plants can use it?

Why is the speed of water an important abiotic factor in a fresh water ecosystem?

Which of the following is not a type of grassland?

Which biome is the most biologically diverse?

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