Use a piece of masking tape to mark the spot where the person's head touches the wall. Measure the distance from the tape to the floor. Purchase tadpoles from a biological supply company. Have students observe and record by drawing the tadpoles as they undergo metamorphosis. Adding the hormone thyroxine to the water with the larvae speeds up metamorphosis.
Life begins for humans as one fertilized egg.
Fertilization and development of an embryo occur inside the body of a female. The stages of development of the unborn child are embryo and fetus. An embryo undergoes a series of cell division and development to form a fetus. The embryo is called a fetus at two months. The sex of the child is determined by the father's chromosomes.