What kind of mixture is described below? Explain your reasoning. "The pieces remain separate and do not combine."

Try for two complete sentences.

a homogenous
b heterogenous

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.