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.

the answers are excess supply, and fall

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(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity