13. Select the correct answer to complete the sentence. Gravitational force is said to be universal because:
O it operates in one direction.
O it operates only within our solar system.
O it applies mainly to planets and moons.
O it applies to all objects.
O it applies to all objects.
The correct answer is: O it applies to all objects.
To determine the correct answer to complete the sentence "Gravitational force is said to be universal because," we need to understand the concept of universal gravitational force.
Gravitational force is the force of attraction between two objects with mass. It is said to be universal because it applies to all objects, not just planets and moons or within our solar system.
The correct answer to complete the sentence would be: "O it applies to all objects."