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This is the teacher's guide of the Breathing unit for a middle school Human Biology book.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
Ontogeny: development of an individual from the moment the egg is fertilized up till adulthood. See more
Ontogeny - Visual Dictionary - Copyright © 2005-2016 - All rights reserved.