Select all of the following that are physical changes A. turning a tin can into aluminum foil B. breaking a window into very tiny pieces C. photosynthesis D. iron rusting and breaking apart E. crushing a can F. melting a can

The answer for #3 is c but i don't know why

The diagram shows the structures of horse and cat forelimbs. what does the diagram suggest about the evolutionary relationship between these two mammals? a. they have homologous structures, indicating a common ancestor. b. they have analogous structures, indicating a common ancestor. c. they have homologous structures, indicating that they do not have a common ancestor. d. they have analogous structures, indicating that they do not have a common ancestor.

In the particles are arranged in a regular, repeating pattern. a)a crystalline liquid b)a crystalline solid c)all gases d)all solids