Which of the following examples of natural selection in action would tend to increase the genetic variation in the population?
Natural selection simultaneously selects against heavy field mice (they starve during winter) and light field mice (they freeze during winter).
Natural selection causes dragonflies to evolve longer tails.
Natural selection acts on beak size in finches such that those individuals able to eat small, soft seeds survive through the winter.
Alpine sky-pilots evolve large flowers above the timberline and small flowers below the timberline.
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