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Across 6. Before Birth 7. The act or process of growing 12. The union of an egg and sperm cell 16. The early successive divisions of blastocyst cells into smaller and smaller cells 17. Attaches the embryonic disk to the placenta 18. Is an early stage embryo consisting of cells in solid ball contained within the zona pellucida 19. Outer most germ layer 20. Fertilized egg cell

Down 1. middle primary germ layer 2. Immature egg cell 3. off spring 4. Opening in the interatrial septum of the fetal heart 5. Forms during the 2nd week and attaches to the embryonic disk 8. hollow cavity 9. Cord-like structure connects fetus and placenta 10. 2 week embryo 11. Process by which a structure enlarges 13. After Birth 14. Inner most germ layer 15. Begins at the end of the 8th week of development and lasts until birth