What percentage of birth defects are attributed to teratogens?

The correct answer indicates that 5-10% of birth defects are attributed to teratogens. Teratogens are environmental agents or factors that can lead to developmental abnormalities in a fetus during pregnancy. While various genetic, environmental, and lifestyle factors contribute to birth defects, teratogenic effects account for a specific share of these cases.

Research has shown that the vast majority of birth defects have no identifiable cause, and among the known causes, teratogens are responsible for a considerable yet limited portion. This percentage reflects the understanding that while teratogens can significantly impact fetal development, they do not account for the majority of birth defects. Factors like genetics, maternal health conditions, and fortuitous circumstances during pregnancy are often more prevalent causes.

Therefore, by stating that 5-10% of birth defects result from teratogenic influences, the correct answer acknowledges the role that environmental exposures can play while emphasizing that the contributions are not overwhelmingly high compared to other causative factors.