The lowest and thickest layer of the atmosphere is troposphere
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1.answer: As the focal distance increases the eccentricity decreases making the planets orbit more circular 2.answer:0
The correct answer is option B, that is, Genetic drift greatly affects small populations, but large populations can recover.
Genetic drift in combination with mutation, natural selection, and migration is one of the most fundamental mechanisms of evolution. Genetic drift refers to a change in the relative frequency of distinct genotypes in a small populace, owing to the chance vanishing of specific genes as individuals do not reproduce or die.