What is the role of gravity in the formation of the moon and in its motion

Gravity in our universe. Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth. The gravitational pull of the moon pulls the seas towards it, causing the ocean tides. Gravity creates stars and planets by pulling together the material from which they are made.

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"a.) well–developed vascular system."

c is the correct answer hope this !