If wolves were now removed from Yellowstone National Park
A) elk populations would increase.
B) deer populations would decrease.
C) the vegetation would remain unchanged.
D) vegetation would increase, providing shelter for smaller animals.
Answer: A
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How a male rat behaves toward a female has been shown to alter ____ in her brain, presumably then
activating ___ receptors in some neurons.
a. peptide hormones; neurotransmitter d. neurotransmitter release; testosterone b. neurotransmitter release; steroid hormone e. neurotransmitter release; peptide hormone c. cAMP kinases; steroid hormone
Position of gonads varies in different animal groups. An octopus has gonads _____
a. on the back of its head b. at the ends of its arms c. in the abdominal cavity d. in the coelom
e. on its penisHow does the reabsorption of sodium affect the secretion of potassium?
Density measurements on cracked glass are not to be trusted.
a. true b. false