Why was Carolus (Carl) Linnaeus considered a pioneer of modem taxonomy? (A He was the first naturalist to develop an effective system for classifying organisms.
(B) His system of categorizing organisms into a hierarchy is still used in modern classification systems.
(C) His use of phenetics inspired other scientists to continue to use this method of classification
(D) He was the first to understand that shared evolutionary history produces similar physical characteristics.

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 correct answer is:

a population changes in response to a change in the environment.

a. to encourage apoptosis