Do you agree with the argument that global climate change will have little impact on biodiversity because montane species can move to higher elevations as temperature increases
and continental species can move northward (or southward for species in the Southern Hemisphere)?
Students should recall from the example of Arctic and red foxes in Chapter 22 that Arctic foxes face competition from the northward movement of red foxes, which is in part a response to increasing temperature. The discussion of Sceloporus in this chapter points out that mountains offer a closed-ended refuge: not only does a species moving upward to escape warming eventually reach the top of the mountain, but also most mountains narrow as one moves upward, so the available habitat decreases progressively. (There are, of course, additional problems with a rosy view of infinite space for displaced species to move into, but those two are discussed in the text.)
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The aortic sinus
A. is the first branch off the ascending aorta. B. gives rise to the right and left coronary arteries. C. contains oxygenated blood. D. All of the above
Amino acids and glucose are both absorbed by secondary active transport by the small intestinal epithelial cells
Indicate whether the statement is true or false
Diurnal variation in secretion
a. occurs with glucocorticoids. b. is related to the sleep-awake cycle. c. occurs as a result of stress. d. both (a) and (b) above. e. all of these answers.
Which disease is caused by the absence of enteric neurons in the distal large intestine?
A. Multiple endocrine neoplasia type 2 B. Hirschsprung disease C. Gastroenteritis D. Spastic colon