Transmission of the nerve impulse across a synapse is accomplished by
a. the release of Na+ at the presynaptic membrane
b. the release of neurotransmitters at the postsynaptic
c. the reception of neurotransmitters at the postsynaptic membrane
d. only a and c are correct
Ans: c. the reception of neurotransmitters at the postsynaptic membrane
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Barnacles live a(n) ____ lifestyle
a. planktonic b. infaunal c. nektonic d. sessile e. mobile
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Most causes of speciation are relatively slow, in that the differences separating species take many generations to accrue and establish reproductive isolation. Which of the following is most likely to produce a species in just a few generations?
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