The three most common biological causes of intellectual disability are Down syndrome,fetal alcohol syndrome,and:
A)autism.
B)fragile X syndrome.
C)failure to thrive.
D)lead poisoning.

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The Answer of The three most common biological causes of intellectual disability are Down syndrome,fetal alcohol syndrome,and:
A)autism.
B)fragile X syndrome.
C)failure to thrive.
D)lead poisoning.

The Three Most Common Biological Causes of Intellectual Disability Are