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Some beetles break down the remains of dead animals. Some mushrooms breakdown the remains of dead trees. How do these actions most benefit plants?

A) By returning nutrients to the soil
B) By releasing oxygen into the air
C) By making space for new animals
D) By decreasing the population of herbivores
Many types of plants grow in a forest ecosystem. How do plants affect the air that forest animals breathe?
A) Plants use oxygen from the air to make food
B) Plants release pollution into the air.
C) Plants release energy from the sun into the air.
D) Plants take in carbon dioxide and release oxygen into the air.