No, some plants rely on animals and wind and water to help scatter their seeds. Some plants have barbs or other structures that get tangled in animal fur or feathers, and are then carried to new sites. Other plants produce their seeds inside fleshy fruits that then get eaten be an animal. The fruit is digested by the animal, but the seeds pass through the digestive tract, and are dropped in other locations. The kind of seeds which are often wind dispersed are smaller seeds that have wings or other hair-like or feather-like structures. Plants living along streams and rivers have seeds that float downstream, and therefore germinate at new sites.
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