WHAT WOULD THE RIGHT OPTION?? how many resonance structures of benzene are known?
A) 3
B) 4
C) 5
D) 6 ​

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.