Which term denotes the end of the 8th week until birth?

• A. Zygote
• B. Fetus
• C. Embryo
• D. Gamete

Answer: (B)

The stage from the end of the eighth week through birth is called the fetus. After fertilization, development is often described in two main phases: the embryonic period, which lasts until the end of the eighth week and is focused on forming organs and body structures, and the fetal period, which begins around the start of the ninth week and continues until birth, focusing on growth and maturation of those structures. So, once the embryonic stage ends, the organism is in the fetal phase.

To connect the other terms: a zygote is the fertilized cell that marks the very beginning of development, and a gamete is a reproductive cell (sperm or egg) before fertilization.