How Do Rain Forests Influence Ecology

How do rain forests influence ecology?

A) materials are washed out of the area and so there is little recycling of nutrients
B) rain forests can take up large amounts of carbon dioxide and so act as a buffer against climate change
C) plants capture solar energy and so cause the ground to become warmer and drier
D) most of the species in rain forests are near the ground surface rather than in the tree-top canopy
E) all of these