Which of the following is a major factor that drives the evolution of the adaptation of biological resistance (with natural selection in mind)? Your

Individuals compete for unlimited natural resources

Variation exists within species populations

Organisms produce very few offspring

Environmental stability increases genetic perfection in organisms

telophase and anaphase

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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sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate