The two gasses that make up 99% of the earth's atmosphere are nitrogen and oxygen.
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The correct answer is stabilising selection. This is selection that favours an average trait value. It is thought that this sort of selection is very common as traits among most animals do not appear to change drastically over time. Stabilising selection selects against the extreme traits, and leads to a decrease in genetic diversity by favouring the average phenotypes.
Answer:
Chlorophyll-to trap enough light for photosynthesis
