Which of the following is true about the mass of an object? it decreases if weight increases. it cannot be measured accurately. it is the amount of matter in the object. it is the amount of space occupied by the object.

It is the amount of matter in the object.

Explanation:

It is the amount of matter in the object, in physics mass is how much matter is there on an objet, the volume depends of how much does this matter occupies on the space, and the weight is the force with which the object is pulled into the gravitational force of the planet or space where the object is, for example, in space since there´s no gravitational foce, all objects weight the same. But all objects have mass, and have an amount of matter in them.

d) a person who learns about the world by observing it.

explanation:

scientist are people who discover why and how things are done and made in the world.