Which statement about natural selection is true?
O A
Natural selection and evolution are two terms for the same phenomenon.
B. Natural selection is an outdated theory to explain how evolution took place.
C Natural selection is the process by which organisms with more beneficial traits are more likely to survive and reproduce
D. Natural selection is the process by which organisms develop variation in traits, which gives them a better chance of survival.

it is prolly d and c and f

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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i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .