what are the disadvantages of seed dispersal ? 
please reply fast !!

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The further the seed goes, the more likely more of them will grow and make it to maturity. Also, the wider and area a plant lives in, the more likely it will recover if one particular area suffers a drought, or whatnot. If all of them are concentrated in one area, survival will be limited if something goes wrong there. 

Evolution is all about maximizing survival, and the further afield you can throw your offspring, the more places they'll grow, and the more likely the species will survival the long haul.
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