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3 votes
Birth defects can be caused by:

A. genetic factors
B. unknown factors
C. environmental factors
D. all of the above

User Gael
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2 Answers

3 votes
- - D all of the above

This is because genetic factors, unknown factors, and environmental factors are all things that can be caused by birth defects.

User MatrixTXT
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7.7k points
2 votes
all of the above because many thing can cause birth defects
User Chris Balavessov
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8.0k points

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