Which system serves as the interface between the other spheres? a. geosphere b. hydrosphere c. atmosphere d. biosphere select the best answer from the choices provided

The correct answer is option D, Biosphere

Reason -

Biosphere consists of living beings such as animals, plants, insects, etc which need essential element for their survival and these essential elements are found in all other spheres except  the biosphere. The living being needs the following spheres-  

a)An species which is living in biosphere and needs water for inheritance has to interact with the hydrosphere.  

b)An species which is living in biosphere and needs air for inheritance has to interact with the atmosphere  

c)An species which is living in biosphere and needs land for accommodation  has to interact with the  lithosphere

Thus it is clear that biosphere serves as the interface between different spheres.

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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