A substance has a mass of 405 g and a volume of 225 cm3. What is the substance? Aluminum (3.7 g/cm3)

Bone (1.7-2.0 g/cm3)

Water (1.00 g/cm3)

Gasoline (0.66-0.69 g/cm3)

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.