Across
- 2. The first process of development in an organism
- 4. An embryo after blastula
- 6. middle developmental layer between the ectoderm and endoderm
- 10. outermost membrane
- 13. sac A small membrane structure outside the embryo
- 15. The production of gametes
- 18. A cluster of dividing cells
- 20. membrane Consists of chorion
- 21. Haploid cells
- 22. Cell division in animal cells
Down
- 1. A hollow sac structure
- 3. Cells formin the cells outside the blastocyst
- 5. A thin membrane around the embryo
- 7. The production of sperm
- 8. Combining a male and female gamete
- 9. an organ that develops in the uterus during pregnancy
- 11. A diploid cell
- 12. An animal embryo
- 14. inner germ layer that forms the linings of the respiratory tracts
- 16. The formation of female gametes
- 17. The blastula is reorganized into multiple layers
- 19. one of the three primary germ layers