Exam 18: Communities and Ecosystems

Resource partitioning is the result of ____.

The cowbird chick with its foster parent exemplifies an example of ____.

In contrast to predation, a parasite usually ____.

Although energy flows in one direction in an ecosystem, nutrients ____ through an ecosystem.

Most of the water vapor in the Earth's atmosphere comes from evaporation from ____.

The process that converts nitrate into nitrogen gas is known as ____.

An example of keystone species are ____.

Which is a characteristic of parasites?

About half of all Americans rely on ____ for their drinking water.

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

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

Approximately ____ of Earth's total primary production is supplied by the ocean's primary producers.

Nitrogen gas is first converted into _____ by certain_____ before it enters the land nitrogen cycle.

Nitrogen is released into the atmosphere by ____.

Which is formed from the carbon shells of marine organisms?

The interaction in which one species benefits and the second species is neither harmed nor benefited is ____.

Which is an example of a detritivore?

In an Arctic food web, the organisms in these pictures represent the ____.