Neural tube defects occur in the brain and spinal cord in the fetal period. When do these defects occur?
1. Within the first trimester
2. Within the first 6 weeks
3. When the egg is fertilized
4. Within the first 28 days after fertilization
4
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1. This answer is not specific enough.
2. This is outside of the range.
3. Development of the neural tube is minimal at this point.
4. Neural tube defects occur within the first 28 days of fertilization, before the woman knows that she is pregnant.
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