Practice+Quiz+7


 * __Questions:__**


 * 1**. Name the three stages of early development.
 * 2.** Desctibe the role of the placenta.
 * 3.** Describe the process of fertilization.
 * 4.** What are the three germ layers that result from gastrulation?
 * 5.** What is oxytocin, and what is its role in childbirth?
 * 6.** When does the embryo become a fetus?
 * 7.** What is the amniotic sac?
 * 8.** What is a zygote?
 * 9.** What is the function of the umbilical cord?
 * 10.** What are the differences between identical twins and ferternal twins?
 * 11.** What factors contribute to a healthy lifestyle?


 * __Answers:__**

1.   The three stages of early development include implantation, gastrulation, and neurulation. 2.   The role of the placenta is the embryos organ of respiration, nourishment, and excretion. 3.   The process of fertilization is a sperm joining an egg. 4.   The three germ layers that result from gastrulation are, mesoderm, and endoderm. 5.   Oxytocin is a hormone that is released from the mother’s posterior pituitary gland. 6.   The embryo becomes a fetus after eight weeks. 7.   The amniotic sac is a sac around the baby that protects and nourishes it. 8.   A zygote is a fertilized egg. 9. It conects the baby to the mother., 10. Identical twins look exactly alike and ferternal twins dont 11. Eating fruits and vegetables, multi grains, excercising, getting enough sleep, avoiding drugs and alcohol