The primary difference between Down syndrome and fetal alcohol syndrome is the role of environment related to their etiology.

Name: The primary difference between Down syndrome and fetal alcohol syndrome is the role of environment related to their etiology.
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Down syndrome is caused by a genetic abnormality, while fetal alcohol syndrome is caused by exposure to alcohol in the womb. Therefore, the role of environment is a primary factor in the development of fetal alcohol syndrome.

The Primary Difference Between Down Syndrome and Fetal Alcohol Syndrome