What types of matter could be separated by physical methods?

I believe the correct answer to this question is:

"Mixtures"

By definition, mixtures are combination of substances which are not really chemically combined and hence separable by physical means. There are two types of mixtures, homogeneous and heterogeneous, both are also separable by physical means.

This is as opposed to Compounds which are chemically bonded and cannot be separated by physical means.