NEET BIOLOGY

Detailed explanation-1: -Amniotic sac. A thin-walled sac that surrounds the fetus during pregnancy. The sac is filled with liquid made by the fetus (amniotic fluid) and the membrane that covers the fetal side of the placenta (amnion). This protects the fetus from injury.

Detailed explanation-2: -Adverse pregnancy outcome from environmental factors may include congenital anomalies, increased risk for miscarriage, preterm delivery, intrauterine growth restriction and still birth.

Detailed explanation-3: -These factors include (1) smoking (2) medicinal drugs (3) recreational drugs (4) alcohol (5) pathogens (6) radiation (7) malnutrition and (8) excess vitamins. The pregnant individual should be very careful about each of these factors as they can bring much harm to that developing embryo.

Detailed explanation-4: -When egg and sperm meet, a zygote is formed and quickly begins dividing to become an embryo. As pregnancy progresses the embryo becomes a fetus. The fetus becomes a neonate or newborn at birth.