Why are certain traits adaptations in one environment, but not in another?
o
a. organisms can learn new adaptations.
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b. some environments cause more mutations than others.
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c. different environments have different abiotic conditions.
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d. all environments have the same amount of competition.

answer:

c

explanation:

answer; ///i believe that the correct answer is (d); ///

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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