Which statement about the orinoco river is true. a. it flows through ecuador b. it is second longest river in south america c. it flows through venezuela d. it empties into the pacific ocean

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.