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The brain is fully developed A. in the fetus. B. at birth. C. at the onset of adulthood. D. in the newborn.

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Thank you for posting your question on Brainly. It means a lot.  The correct answer is C. at the onset of adulthood.


The brain becomes fully developed at around the age of 21. Though the majority of the development occurs in the infant and toddler years, the brain isn't fully developed until C. the onset of adulthood. Hope this helps!

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