The sum of all the genes in a population is referred to as the gene pool.
UV rays reacting with the O2 molecules
I might be wrong a little but
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A. Organisms with less desirable traits do not reproduce
is the answer
Since 1910, the urban population has grown by nearly 500 percent while the rural population has grown by 19 percent. ... The Census Bureau estimates that during the same 30-year period, the population of the 49 states grew by more than 82 million people, or 36 percent
IF I WAS KNOWING THE ANSWER FOR SURE I HAD HELPED U ....
THE THINK IS IDEK!!