I would say
O sediment flowing down a slope
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.
In a typical cell membrane, phospholipids arrange themselves to form a bilayer. This bilayer is a thin membrane which is considered a polar membrane composed of two layers of lipid molecules. This serves as a barrier around the containing cells.
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