When taxonomists recognize subspecies, they are identifying:
A. populations that are reproductively isolated
from one another.
B. populations with restricted enough gene
flow to develop some population-specific
traits, but that can still interbreed.
C. populations that will, within a few
generations, become separate species as
reproductive isolation is nearly complete.
D. populations with extremely restricted gene
flow due to allopatric isolation.
E. none of these
B
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Humans have disrupted the nitrogen cycle primarily by ____
a. irrigation b. cutting down forests c. using nitrogen-containing fertilizers d. crop rotation e. leaching
The typical waking and sleeping cycles of most people can be described as:
a. crepuscular. b. nocturnal. c. diurnal. d. lunar. e. annual.
Illness, stress, or anxiety override the negative feedback loop that regulates ____, thus causing its level to soar.
A. cortisol B. somatotropin C. insulin D. prolactin E. parathyroid hormone
Why is the cost of sex sometimes also referred to as the "cost of males"?
a. Males do not contribute genes to the next generation. b. Males do not produce new offspring. c. With finite resources, males take the place of offspring producing females. d. Sperm cells do not contribute any substantial energy resources to the eggs they fertilize. e. B, C, and D.