What an amino acid and what is there purpose

Amino Acids: Amino acids are a group of organic compounds that form the building blocks of proteins that make up 75% of the body. They are involved in almost every body function, including growth and development, healing and repair, normal digestion, and providing energy for your body.

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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answer; the correct answer is desert plants;