The fetus is the

A) agent that can harm prenatal development.
B) developing organism from about 2 weeks after fertilization through the second month.
C) developing organism from 9 weeks after conception to birth.
D) fertilized egg.

The fetus is the developing organism from 9 weeks after conception to birth. It is the stage of prenatal development after the embryonic stage (from about 2 weeks after fertilization through the second month). The fertilized egg (or zygote) is the very first stage of prenatal development. So options A and B are incorrect.