Question

a pure substance is made up of what? one type of element or molecule more than one type of element or molecule rewatch

Explanation:

A pure substance has a uniform, fixed composition. It can either be an element (composed of a single type of atom) or a compound (composed of a single type of molecule made from fixed ratios of elements). Mixtures, by contrast, contain more than one type of element or molecule.

Answer:

one type of element or molecule