Which of the following does work?
A. An apple growing on a tree.
B. An apple on a table.
C. An apple being pushed across the floor.

C. An apple being pushed across the floor

Explanation:

Do do work, the direction of the force and the motion of the object has to be the same. For example, holding an apple in the air isn’t doing work because the Apple is motionless but the force is going upward from your hand to hold it up. But if you hold the Apple and push it upward then it does work because it is moving upward and you are also pushing upward. Hope this helps!

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 correct answer is (reactants);