Question

One similarity between all mixtures and compounds is that both(1) are heterogeneous(2) are homogeneous(3) combine in a definite ratio(4) consist of two or more substances

Answer 1

Mixture is a combination of two or more substances. The components of the mixture are not chemically reacted and can be separated using physical means.
compound is a combination of two or more substances that are chemically reacted or bound together. The components of the compound cannot be separated except by chemical reactions.

Answer:
(4) consist of two or more substances

Answer 2

Mixtures and compounds are a combination of two or more substances. A mixture could be like coffee and water or salt and water ie like a solution and a compound can be like a mineral say galena which is a combination of lead and sulfur both distinct elements which also combine in certain proportions. The result of a mixture or a compound is that the product most likely will have some different characteristics than the original substances taken by themselves.