Which of the following is an example of the cycling of matter? A A sea star dries out when exposed to air and radiation from the sun
B Seaweed releases oxygen that a crab breathes in through its gi is.
C A wave crashes against rock on the shoreline,
D Amussel seals its shell from drying heat of the sun

A A sea star dries out when exposed to air and radiation from the sun

Explanation:

B is your answer byyy mark as brainliest

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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several tissues working together form an organ, and several organs together make up an organisms.

the group of cell that carries out special jobs are tissue.