Describe some ways that industry and agriculture use physical properties to separate substances...

The answers is bad germs in their

C. definite shape, definite volume. that is a solid.

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

B. nuclear reactions could first occur.