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Mètal rètàrdation caused by:

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Answer:

Mental rètàrdàtion caused by what Deficiency

Trisomy 21, also known as Down syndrome, is the most common genetic cause of mèntal rètàrdàtion.

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Answer:

Mental rètàrdàtion caused by what Deficiency

Causes of mental rètàrdation include fetal alcohol syndrome and fetal alcohol effect; brain damage caused by the use of prescription or illegal drugs during pregnancy; brain injury and disease; and genetic disorders, such as Down syndrome and fragile X syndrome.