Question

at which stage of prenatal development is the fetus most vulnerable to teratogens?
embryonic period
postnatal period
germinal period
fetal period
question 45
which of the following describes a key factor in determining the level of damage caused by a teratogen?
the genetic makeup of the father
the timing of exposure during the pregnancy
the temperature of the environment
the educational level of the mother

Explanation:

The embryonic period is when major organs and body - structures form, making the embryo highly vulnerable to teratogens. For the second question, the timing of exposure during pregnancy is crucial as different organs and body systems have sensitive periods of development during which they are more or less affected by teratogens.

Answer:

1. A. Embryonic period
2. B. The timing of exposure during the pregnancy