One of the astronomers on the team does not understand genetics. He does not understand how two aliens with green skin can have a child with yellow skin, but then two aliens with yellow skin cannot have
a child with green skin. Explain to him how this is possible.

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; i believe the answer is (polygenic inheritance;

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully