Charles Darwin said, "It is not the strongest of the species that survives, nor the most intelligent, but the one most responsive to change." Explain what Darwin meant by this statement.

What He meant was the theory of natural selection which was proposed by Him.

Explanation:

What Charles Darwin meant was theory of natural selection which is that populations or organisms develop phenotypic traits or characteristics or organisms have variable traits which help them to survive, adapt, reproduce and well suited to their environmental changes and passing these traits to generations and not about been strong. What He meant was that only organisms that have traits that can help them to respond to changes in their environment and make them survive. This is a survival differential mechanism.

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 d (apex) good luck : ))