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Down Syndrome occurs when an embryo contains an extra chromosome 21 (three instead of two). People with Down Syndrome have similar physical features such as weak muscle tone, small head, slanted eyes, furrowed tongue, flatter face, etc. They also struggle with mental retardation, some more than others. Those with Down Syndrome are more likely to develop further complications as they get older, such as lung problems and Alzheimer's Disease. With the help offered in today's society, these individuals can develop and lead happy lives.
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