Which of the following is true about the mass of atoms? А
An individual atom has no mass.
B
The atom of every element has a unique mass.
С
The mass of an atom increases with temperature,
D
The mass of an atom varies over time

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.