49. Rock, metal, wood, glass, animals, and plants are all forms of what? A. Atoms
B. Non-living things
C. Matter
D. Living things

The answer is D. I’m an pretty sure it is D

Me i need

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).