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Many plants growing in or near water sources have evolved
seeds that float, and can be dispersed by moving water. Perhaps the most familiar example
of this is the coconut. The fibrous coating allows the large fruit to float, and the seed
inside is protected as the coconut travels great distances on ocean currents, until it is
washed ashore in a suitable spot. Rain often plays
a role in seed-dispersal; heavy rains dislodge seeds, and water runoff can carry the seeds
a great distance. This is especially important for plants living on hillsides.
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