The body’s ability to regulate balance in temperature and nutrition is related to the

Hypothalamus

Explanation:

Hypothalamus is that part of the brain that links the endocrine system of the body to the nervous system of the body via pituitary gland.

It is the main site that controls the body temperature, hunger, sleep, fatigue, behavior of the person.

The process by which a balance is maintained in the body in terms of temperature, nutrition is known as homeostasis.

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 the answer would be d