Answer:
It encourages the growth of a group of certain bacteria while inhibiting the growth of others. It contains a high concentration (~7.5%-10%) of salt (NaCl), making it selective for gram positive bacteria Staphylococci (and Micrococcaceae) since this level of NaCl is inhibitory to most other bacteria.
Explanation:
I think it is all of the above but you might want a second opinion.
Naturally ocurring, solid,inorganic, Crystal shape, and definite chemical composition.
I think it is liqid but i dont know realy.