Question

how is seed dispersal is useful for plants

Answer 1

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━━━━━━━━━━━━━━━━━━━The seeds float away from the parentplant. ... If the seeds fall in the water, they are carried away by the tide to grow somewhere else. Kōwhai trees also use water dispersal. They have a hard seed coat that allows them to float down streams and rivers.
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Answer 2

seed dispersal is the process plants use to spread their seeds impatient use force to disperse their seeds, creating explosive seed pods. wind dispersal is use by plants that create many lightweight seeds, carrying them miles from the parent plant , like the dandelion.