AP BIOLOGY

Detailed explanation-1: -Gestation is the period of time between conception and birth when a baby grows and develops inside the mother’s womb. Because it’s impossible to know exactly when conception occurs, gestational age is measured from the first day of the mother’s last menstrual cycle to the current date.

Detailed explanation-2: -The gestation period is the time between conception and birthing. It is calculated from the first day of a woman’s last menstrual period. For example, the average human pregnancy lasts 280 days or 40 weeks.

Detailed explanation-3: -First trimester. The first trimester will span from conception to 12 weeks. This is generally the first three months of pregnancy. During this trimester, the fertilized egg will change from a small grouping of cells to a fetus that is starting to have a baby’s features.

Detailed explanation-4: -prenatal development, also called antenatal development, in humans, the process encompassing the period from the formation of an embryo, through the development of a fetus, to birth (or parturition).