Which statement best describes what happens during mitosis? A. The chromosomes in the cell's nucleus are copied.
B. The cell goes through a period of growth.
C. The gametes fuse to form a new cell.
D. The nucleus divides into two identical nuclei.

The answer will be A as I think

D

Explanation:

the answer is tropical areas. the tropical areas obtain more

radiant energy from the sun than they lose to space through terrestrial

radiation, and vice versa for polar areas. earth has an energy remaining in the

tropics and an energy scarcity for the polar areas.

explanation:

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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