Once pollen lands on the stigma of a flower, the pollen germinates, creating a pollen tube that grows down the ovule. The sperm cell moves through the tube to fertilize the egg. Based on the evidence from the experiment above, explain how natural selection might have led to directional selection toward higher aperture number.

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Q: Which one of the three possible results of natural selection does this experiment demonstrate and…

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A:

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Pre-Darwinian Concepts