The separation of populations by a barrier such as an ocean is called

a. geographic isolation.
b. temporal isolation.
c. genetic equilibrium.
d. behavioral isolation

why are common names not always useful to biologists?

a. they are in latin.
b. they are too long.
c. they can apply to more than one animal.
d. they require the use of a dichotomous key.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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the answer is:

carbon dioxide