What is Arnold Gesell's overall contribution to child development?

Over a century ago, Gesell began creating a map for child development and learning. His main contribution to child development was identifying the relationship between behavior and brain—in other words, between what children do and how their brains grow.

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  the common sense as a pamphlet written by thomas paine. it promoted the independence of the colonies from british rule. the distribution of this pamphlet was great, it reached people everywhere and it was even read aloud at places people met. it also unite the colonists before the revolutionary war.

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