Ahas distinct properties and composition that never vary. a) solution b) molecule c) pure substance d) heterogeneous mixture

C)pure substance

Explanation:

Pure substance is any substance formed by only one type of molecule, of invariable and homogeneous chemical composition, which has constant physical and chemical properties. Pure substance may exist in more than one phase, but in such cases the phase composition will be the same.

In short, pure substance is all material with the following characteristics:

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle