I really need help please someone help me?!.

Those are all the questions.

The answer for #3 is c but i don't know why

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

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.