Answer:
Clouds are made of microscopic droplets of water ranging from 1 to 100 microns. Although, a water droplets total size, water's density is still much greater than air, and over time the earth's gravitational pull should cause the water droplet to fall.
Whelp, it is definitely not D.
I would say B.
there was no Paleogene period.
Answer:
This is usually the first day of menstruation - the day when the uterus lining starts to be shed.
Explanation: