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
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Which of the following does not belong in the
clade of class Reptilia? a. turtle b. snakes c. birds d. lizards e. all of these belong
Calcium intake is important for women during pregnancy. If a woman for whatever reason does not get enough calcium in her diet during pregnancy, what is likely to happen to her bone tissue?
A) She will experience severe bone loss due to the loss of estrogen production during pregnancy. B) She may experience some bone loss due to the lack of calcium in her diet, but nothing significant. C) She may experience significant bone loss due to both the lack of dietary calcium and the fact that the fetus requires extra calcium, which will be removed from her own bone tissue. D) The fetus will be born without a skeleton.
The nonporous, flexible central region of a tracheid wall pit in conifers is called
a. resin duct b. torus c. end wall d. sorus e. xylet
How many chromosome pairs does a human have?
A. 46 B. 50 C. 92 D. 25 E. 23