What observations would be useful in comparing the movement of the sun across the sky during the day to the movement of the stars across the sky at night? Choose the two correct answers. A. Identify the direction in which the sun moves. B. Identify the names of stars in a constellation. C. Identify the direction in which the stars move. D. Note the color of the sun when it rises and sets. E. Compare the brightness of the sun with that of the stars.

A and b

Identify the direction in which the sun moves.

Identify the direction in which the stars move

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.  

read more on -