Wind, water and animals are the ________ factors by which seed dispersal occurs.

internal

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external

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primary

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secondary

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Solution

The correct option is B external
The outside factors which help in the dispersal or spread of seed are called external factors. So wind, water and animals are the external (i.e. outside) factors by which seed dispersal occurs. Whereas explosion is an internal factor of seed dispersal as the seed explodes on its own.

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