In the northeastern Pacific ocean, sea otters occur at a relatively low abundance. By preying upon sea urchins, sea otters maintain underwater kelp (large algae) "forests", which would otherwise be decimated by the herbivorous sea urchins. The kelp forests supply food for a wide variety of marine organisms, as well as providing refuge from predation and nursery habitat for juveniles. Based on this, what type of species best describes sea otters?

A. umbrella species
B. dominant species
C. flagship species
D. indicator species
E. keystone species


Answer: E

Biology & Microbiology

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Which of the following does not belong in the

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The nonporous, flexible central region of a tracheid wall pit in conifers is called

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How many chromosome pairs does a human have?

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Biology & Microbiology