Exam 27: Community Interactions

In the process called ________, species act as agents of natural selection on one another.

In most environments, two or more organisms occupy identical niches. True or False?

Earthworms live in many grass and forest ecosystems, and they aerate the soil as they burrow. They also may mix soil layers as they ingest organic matter and travel between layers. These traits, taken collectively, make up the ________ of the earthworm.

Parasites act as agents of ________, leading to changes in the host population that make it more resistant to the parasite.