... , in most cases. People grow physically starting from birth. During Infancy, most of the brain cells a person will ever have are present at birth. However. the neural connections that enable walking, talking, and memory are only beginning to form through the span of childhood. This neural immaturity may explain why we have no memories of events before 3 years of age, also ... ) and secondary sex characteristics (non reproductive traits) develop dramatically. During adulthood to late adulthood, muscular strength, reaction time, sensory keenness, and cardiac output all peak by the mid twent...

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• Grade Level: Undergraduate