Across
- 5. the united egg and sperm
- 6. the pregnancy is divided in to three periods of time
- 9. medical care needed during pregnancy
- 10. fluid-filled bag of thin tissue
- 11. the developing human is called this between the third and six month of development
- 12. a ropelike structure that develops between the embyro and placenta
Down
- 1. a hollow, spherical structure made up of about 50-100 cells, formed when an embryo divides and grows
- 2. the stage of human development from the two-cell stage until about nine weeks after fertilization
- 3. attachment holding the embryo to the wall of the uterus
- 4. a doctors specialized in pregnancy and childbirth
- 7. the blastocyst begins to attach itself to the wall of the uterus
- 8. high-frequency sound ways used to create images of the developing fetus