Why do astronauts need to wear pressurized suits in space? a.
Because air pressure is so great in space they could be crushed without the suits.
b.
Because without the pressure in the suits the astronauts could freeze to death.
c.
Because Space is a vacuum, the astronauts' bodies could explode without the suits.
d.
The pressure protects them from solar radiation.

Please select the best answer from the choices provided

A
B
C
D

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: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation: