Hormones may have very different effects during the prenatal and later life stages of an animal, a concept best described by the terms ________.

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The terms "activational" and "organizational" refer to the different effects hormones can have at various life stages. Organizational effects typically occur during critical periods of development (such as prenatal stages), structuring the brain and body in long-lasting ways. Activational effects occur later in life, often at puberty or adulthood, activating the structures and pathways laid down earlier.

Hormones May Have Very Different Effects During the Prenatal and Later