Physical abnormalities are most likely to result when there are harmful agents in the prenatal environment during
A) the second trimester.
B) any trimester.
C) the first trimester.
D) the third trimester.

Question

Quizplus · Accepted Answer

The first trimester is a critical period of development, during which major organ systems are forming. Exposure to harmful agents during this time can have significant consequences for fetal development, leading to physical abnormalities such as birth defects. Exposure in later trimesters may still have negative effects, but the risk of physical abnormalities is highest during the first.

Physical Abnormalities Are Most Likely to Result When There Are