Jaws and paired fins evolved in early __________. Fill in the blank(s) with the appropriate word(s)
ANSWER: fishes
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Which one of the following statements about the trophic cascade in the sea otter and sea urchin-kelp communities along the West Coast of North America are true? Check all that apply.
_____ Increased sea otter populations are linked to more profuse growth of the kelp forests. _____ Increased orca (killer whale) predation on sea otters is linked to more profuse growth of the kelp forests. _____ Increased sea otter populations are linked to increased sea urchin populations. _____ Increased orca (killer whale) predation on sea otters is linked to increased sea urchin populations. _____ Increased sea urchin populations are linked to less profuse growth of the kelp forests.
Significant features of the coupling of an endergonic and an exergonic reaction is that _____.
a) the value of a positive delta G for one of the reactions can be overcome b) the two reactions have a common intermediate c) the hydrolysis of ATP can be used to drive the overall reaction d) all of the choices are correct
During the life history simulation you first started with the predation at 0.8 and subsequently lowered it to 0. Removing predation caused which of the following variable to increase dramatically?
A. Size B. somatic maintenance C. Reproductive investment D. growth investment
If you wash your skin and hair several times a day, you will soon have dry skin that easily cracks and bleeds because the oils you have removed are necessary to keep the skin supple. This oil is
A. salty sweat secreted by sweat glands. B. lymph secreted by lymphatic ducts. C. pili secreted by arrectors. D. sebum secreted by sebaceous glands. E. sebum secreted by sweat glands.