<span>Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
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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.
Absolute time is the answer
Mass is measured by using a balance comparing a known amount of matter to an unknown amount of matter. Weight is measured on a scale.
