Most Teratogens Are Most Harmful to the Developing Fetus During

question 198

Multiple Choice

Most teratogens are most harmful to the developing fetus during the first trimester because

• A) the fetus has not gathered sufficient resources to combat the effects of teratogens.
• B) the placental barrier has not yet fully developed.
• C) the fetal immune system is not yet capable of mounting a response to the teratogenic substance.
• D) the first trimester contains the critical period of development for many major systems and body structures.