At the moment of conception, each person begins life as a single cell, which is called a(n):
A) embryo.
B) fetus.
C) placenta.
D) zygote.

Question

Quizplus · Accepted Answer

At the moment of conception, when the sperm and egg unite, the resulting single cell is called a zygote. The zygote undergoes a series of cell divisions and eventually develops into an embryo, then a fetus, and ultimately a fully formed baby. The placenta is an organ that forms during pregnancy and serves as a lifeline between the mother and developing fetus, but it does not exist at the moment of conception.

At the Moment of Conception, Each Person Begins Life as a Single