During summer, the scorpion constellation can be easily seen. During winter, the Scorpion cannot be seen. How would you explain this observation? A. In winter, the Scorpion is usually hidden by the moon.

B. In winter, the Scorpion is covered by the Milky Way.

C. In winter, the Scorpion is in the sky during the day.

D. In winter, the Scorpion is often hidden by clouds.

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.