Where can I find info on molecules; i.e., where they come from, their function, what they do for our body...

Answer 1

Try doing a Google search on "define:molecule".

Or Google "source of molecues"/"function of molecules", etc.

Does that help you?

Answer 2

Molecules are composed of atoms. Here is a site that give some discussion of where molecules come from and some of their uses.

Answer 3

Sorry, I didn't post the site.
http://en.wikipedia.org/wiki/Molecule