Adaptive radiation means that ____.
Fill in the blank(s) with the appropriate word(s).
many species evolve from a single common ancestor in a short period of ti
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Which of the following best describes the development of sexual structures in mammals?
A. Embryos develop male structures only once the SRY gene on the Y chromosome. becomes active; if SRY is not present, they develop female structures. B. Embryos initially develop female structures, but these degenerate and male structures develop once SRY becomes active. C. Embryos initially develop both male and female structures; once SRY becomes active, female structures degenerate and male structures continue to develop. D. Embryos initially develop male structures; if SRY is not present, these degenerate and female structures develop. If SRY is present, they continue to develop. E. None of these accurately describes the development of sexual structures in mammals.
The spinifex hopping mouse that is very different from other mice as it is adapted to the extreme desert environment. What will happen to this mouse if no water is available at all?
A. Like any creature, it will die without water. B. Unlike the devastating effects that water deprivation would have for almost any other species, nothing will happen to the spinifex hopping mouse, as it obtains sufficient water from its metabolic activities. C. Unlike the devastating effects that water deprivation would have for almost any other species, nothing will happen to the spinifex hopping mouse, as it obtains sufficient water from its biochemical activities. D. Unlike the devastating effects that water deprivation would have for almost any other species, nothing will happen to the spinifex hopping mouse, as it obtains sufficient water from recovered water. E. Unlike the devastating effects that water deprivation would have for almost any other species, nothing will happen to the spinifex hopping mouse, as it obtains sufficient water from its salt glands.
A clade includes which of the following?
A. an ancestor and all its descendant species, and taxa with shared derived characters B. an ingroup only C. an outgroup and an ingroup D. a common ancestor and all its descendant species E. one taxon with shared derived characters
Studies have found that the positive-incentive value of various tastes is _________ in anorexic patients than in control patients.
(a) lower (b) higher (c) more likely to be absent (d) more variable