Exam 17: Communities and Ecosystems

At the bottom or base of an energy pyramid are the ____.

Two species of closely related squirrels both feed on acorns produced by oak trees. One species feeds exclusively near the top of the tree and the other feeds exclusively towards the bottom of the tree. This is an example of ____.

An example of a nonbiological factor that affects community structure is ____.

The greatest concentration of nitrogen on Earth is found in ____.

Which is an example of a detritivore?

Some ___ have enzymes to break the bonds of atmospheric nitrogen and use it for the metabolism of proteins and other nitrogen containing molecules.

Which is an example of an event that would give rise to primary succession?

An example of a primary consumer is a(n)____.

The plants and animals present in a region from which the trees were removed ten years earlier represent ____.

An interaction that benefits both species is ____.

The first plant to colonize the plains of Mount Saint Helens after this volcano erupted in 1980 was a prairie lupine. The prairie lupine is therefore an example of ____.

An example of a one-way relationship in which one species benefits and another is directly hurt is ____.

RIFAs are a(n)____ species.