Which is an example of the gravitational force?

1.a basketball that was thrown in the air falls to the ground
2.the particle that makes up the neutrons in an oxygen atom are held together
3.a radioactive element, uranium, decays and becomes stable
4.the molecules that make up olive stick together

1.a basketball that was thrown in the air falls to the ground

Explanation:

1.a basketball that was thrown in the air falls to the ground

From newton law of universal gravitation, it state that a object of any mass will  have the tendency to come down when throw to the atmosphere.

this is the reason why acceleration due to gravity of any object thrown up are always the same. Acceleration due to gravity on earth is 9.8 m/s2.

the gas collects in coils that then becomes a liquid that then flows through the coils inside the refrigerator