Question

why is the law of gravity an example of a universal law?
gravity exists between small masses in an open system only.
gravity exists only on the earth and the moon.
gravity exists for masses in a closed system only.
gravity exists between any two masses.

Explanation:

The law of gravity is universal as it applies to all masses in the universe. It is not limited to open or closed systems, nor to specific celestial bodies like Earth and the moon. It acts between any two masses.

Answer:

Gravity exists between any two masses.