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Published on 25 Oct 2014 | over 2 years ago

Created by Jeff Otjen.

Watch the next lesson: www.khanacademy.org/test-prep/mcat/behavior/human-development/v/implantation

Missed the previous lesson? www.khanacademy.org/test-prep/mcat/behavior/human-development/v/egg-sperm-and-fertilization

MCAT on Khan Academy: Go ahead and practice some passage-based questions!

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