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A '''birth defect''' is a structural, functional, or metabolic abnormality present at birth that results in physical or mental disability or is fatal. There are more than 4,000 known birth defects, which may be caused by [[gene|genetic]] or [[environment|environmental]] factors. About 150,000 babies are born each year with birth defects. Birth defects have become a major argument advancing the theory of [[Intelligent Design]]. Currently, [[evolution]] has no credible explanation for the development of birth defects as a trait.
A '''birth defect''' is a structural, functional, or metabolic abnormality present at birth that results in physical or mental disability or is fatal. There are more than 4,000 known birth defects, which may be caused by [[gene|genetic]] or [[environment|environmental]] factors. About 150,000 babies are born each year with birth defects.
[[Category:Genetics]]
[[Category:Genetics]]