The role of mass extinction in evolution. At the most basic level, mass extinctions reduce diversity by killing off specific lineages, and with them, any descendant species they might have given rise to. ... But mass extinction can also play a creative role in evolution, stimulating the growth of other branches.
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A. An increase in the amount of acid rain can change the pH of soil in an ecosystem.
By the sexual combs, the flies of the male fruits have a structure similar to a brush comb near their hind legs.
