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OpenStudy (anonymous):
Providing examples, explain how sexual reproduction in plants has evolved to become less dependent on water
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OpenStudy (anonymous):
Pollen. The nonvascular plants and even a few vascular plants (e.g. ferns) reproduce by having the sperm swim through the external environment. This swimming requires a water film in the external environment, and also requires that the ovum be in a structure close enough to the ground that the sperm can swim to it. Gymnosperms and angiosperms make pollen. Sperm are confined within a pollen grain. No swimming is required.
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