Across
- 1. Embryo that looks like a person
- 4. Extraembryonic membrane that helps with gas exchange
- 7. Blastula develops into a gastrula
- 8. Membrane that helps the baby gets nutrients from mom
- 9. Fertilized egg
- 11. The fertilized egg attaches to the lining of the uterus
- 13. Forms the primitive gut
- 15. Union of and egg and sperm
- 16. Hollow ball of cells
- 17. This keeps the embryo in fluid
Down
- 2. The outer embryonic tissue layer
- 3. Baby food
- 4. Zygote divides without an increase in size
- 5. Formation of organs
- 6. The extraembryonic membrane that acts like a trash bag
- 10. Human's blastula
- 12. The middle embryonic tissue layer
- 14. Transition from zygote to multicellular organism