This class of mollusk includes snails
a. Bivalvia
b. Annelida
c. Gastropoda
d. Pseudopoda
e. Cephalopoda
C
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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. indicator species. B. flagship species. C. keystone species. D. dominant species. E. umbrella species.
Why might predators take more time to recover following a disturbance than herbivores or producers?
a. Recovery time is based on the flow of energy, so herbivores recover first, then producers, and then predators b. Recovery time is based on the flow of energy, so producers recover first, then herbivores and finally predators. c. Recovery time is based on solar cycles, and thus predators are the second group to recover. d. Predators actually recover more quickly than others because of their mobility.
Microorganisms in deep-sea vents and caves serve as autotrophic primary producers in the absence of sunlight
Indicate whether the statement is true or false
Which of the following areas/conditions would be favored by thermophiles?
A) the stomachs of herbivores B) the arctic tundra C) deep-sea volcanic vents D) anaerobic conditions