Which remains the same as the distance of an object from earth changes?

Mass of the object

Explanation:

Mass is the amount of matter in a body or object that is measured on a balance. The weight is calculated by the formula mass x gravity. However, gravity changes according of where we are. In short, weight is the force of attraction of a planet on a body located on its surface.

According to newton's law of gravitation, it is the force of mutual attraction that bodies experience by having a certain mass. The force of attraction experienced by two bodies endowed with mass is directly proportional to the product of their masses and inversely proportional to the square of the distance that separates them (law of the inverse of the square of the distance). This means, gravity changes with change in distance from Earth's radius.

So in short, only mass doesn't change and it is the independent factor. Whereas weight and gravity will change. Because the greater the distance between two objects, the lesser the force of gravity. And the lesser the force of gravity, the lesser the weight will be even if the mass is the same.

the correct answer is:

a population changes in response to a change in the environment.