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OpenStudy (anonymous):

Natural selections needs ? in order to take place.

OpenStudy (anonymous):

Environmental factors? That's kind of a vague question...it needs alot of factors to take place..

OpenStudy (anonymous):

IT'S ALSO GET EFFETED BY NICHE OF THAT COMMUNITY

OpenStudy (anonymous):

A selection pressure.

OpenStudy (anonymous):

a selection pressure. something like, Graffias food source is very high up so it had to develop a long neck, Graffias with short necks couldn't eat therefore they couldn't reproduce and that trait died off.

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