Which two life functions of animals maintain the water cycle by recycling water back into the environment

a.) digestion and regulation
b.)synthesis and locomotion
c.)respiration and excretion
d.)reproduction and growth

The correct answer would be c.)respiration and excretion.

Excretion refers to the removal of harmful substance or wastes out of the body.

The excretory system helps in removing nitrogenous waste and excess water out of the body.

Skin also helps in excretion of water, salts, and some nitrogenous wastes through sweating.

Respiration not only helps in taking in the oxygen but also help in removing carbon dioxide and water vapors out of the body.

The excreted water then can re-enter the environment by different means such as by evaporation (it enters atmosphere), by mixing (drainage system) with large water bodies such as river or seas, as underground water, or absorbed by plants.

Thus respiration and excretion help in maintaining the water cycle by recycling water into the environment.

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; coat color for blending in with dry grass;