What kind of solid breaks with no regular patterns? A. A metallic solid
O B. A molecular solid
O C. A crystalline solid
O D. An amorphous solid

I put d 100% sure

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.