What force acts between earth and the moona) gravity b) massc) motion d) newtons

Option A, Gravity

Explanation:

Since the moon rotate around the earth in a more or less circular path due to the centripetal force acting on it. This centripetal force is equal to the gravitational force between them which keeps the moon on right tract.

The gravitational acceleration experienced by moon due the gravitational attraction from earth is given by  

Where

G represents  the gravitational constant

M represents the combined mass of moon and earth

r represents  the radius of the orbit on which moon rotates around the earth

Thus, It can be said that the force acting between Earth and the Moon is gravity

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

it takes hundreds of years to become stable.

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