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After Several Weeks of Feeling Apathetic and Dissatisfied with His

question 14

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After several weeks of feeling apathetic and dissatisfied with his life, Mark has suddenly become extremely cheerful and so talkative he can't be interrupted. He seems to need less sleep and becomes irritated when his friends tell him to slow down. Mark's behavior is indicative of


Definitions:

Down Syndrome

A genetic disorder caused by the presence of all or part of a third copy of chromosome 21, characterized by developmental delays and physical features such as a flat facial profile.

Skin Pigmentation

The coloring of the skin caused by the presence of melanin, which can vary greatly among individuals and populations.

Phenotype

The observable physical or biochemical characteristics of an organism, as determined by both genetic makeup and environmental influences.

Height

A measurement of a person or object from base to top or head to foot in either a lying or standing position.

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