Question

which best compares compounds and mixtures?
oa compounds and mixtures contain a variety of elements, but the elements in a mixture do not retain their original characteristics when combined.
ob compounds and mixtures contain a variety of elements, but the elements in a mixture are able to last longer because they are chemically combined.
oc mixtures can be made up of elements and compounds that lack definite proportions, but a compound is composed of elements that are present in definite proportions.
od mixtures are made up of elements and compounds in definite proportions, but a compound is composed of elements that are not present in definite proportions.

Explanation:

A compound is a substance formed when two or more elements are chemically combined in a definite proportion. A mixture is made up of two or more substances (elements or compounds) that are not chemically combined and can be in any proportion.

Answer:

C. Mixtures can be made up of elements and compounds that lack definite proportions, but a compound is composed of elements that are present in definite proportions.