Multiple choice When does an embryo become a fetus? After an egg is fertilized by a sperm cell during conception After fertilization when zygote attaches to the lining of the uterus wall After 15 days After delivery, embryo is called a fetus After 8 weeks of pregnancy Reveal answer Fill a bubble to check yourself E Correct answer Explanation Yes, it is correct, the embryo now resembles an adult and is known as fetus.