Energy cannot be lost or gained, as described by the l A. Potential energy

B. Law of Universal Gravitation

C. Newton's Laws of Motion

D. Law of Conservation of energy

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.