7. What happens to the air pressure in an area
when a cold air mass becomes denser?
A. The air pressure reverses.
B. The air pressure increases.
C. The air pressure decreases.
D. The air pressure stays the same

Option B. The air pressure increases.

Explanation:

The air pressure of warm and cold air is different from one another because in warm air, the distance between molecules is high and there is maximum empty spaces so the air pressure is also lower while in cold air, the distance between particles are very low and there is less empty spaces so due to denser medium the air pressure also increases.

what bodys are there orbiting?

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.