Question

what defines the amount of matter in an object? its weight its mass its volume

Explanation:

The question is about defining the amount of matter in an object. In physics (a subfield of Natural Science), mass is defined as the amount of matter in an object. Weight is the force due to gravity on an object, and volume is the space an object occupies. So the correct option is the one with "its mass".

Answer:

its mass (the option labeled "its mass")