A teratogen is any substance, organism, or physical agent that can harm a developing fetus or embryo. Teratogens can cause birth defects or abnormalities in growth and development. One way teratogens can harm the fetus is by crossing the placenta and interfering with normal development. A poisonous substance is one type of teratogen that can harm a developing fetus.

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A Teratogen

Question 91

Multiple Choice

A teratogen:

A) is a gene that causes a birth defect.
B) develops during the third trimester of pregnancy.
C) enters the ovum with the sperm.
D) is a poisonous substance that crosses the placenta, harming the fetus.

Correct Answer: