Plants having lightweight and feather like seeds move to distant places through air, an external factor. This is seed dispersal by:

gravity

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explosion

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wind

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water

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Solution

The correct option is C wind
Small, lightweight and feather like seeds get dispersed by wind and move to many distant places. For example, the seeds of Dandelion plant are small, lightweight and feather like and thus get easily dispersed by wind.
Also since wind is independent of the plant, dispersion of seeds by wind is an external factor.

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