Across
- 3. a fluid-filled sac that surrounds and cushions the developing embryo
- 4. a developmental process that leads to dramatic changes in shape and form
- 6. immature form of an animal that resembles the adult form but lacks functional sexual organs
- 8. gland in female mammals that produces milk to nourish the young
- 11. specialized organ in placental mammals through which respiratory gases nutrients and waste are exchanged between the mother and her developing young
- 12. regulates the transport of oxygen from the surface of the egg to the embryo and the transport of carbon dioxide, one product of respiration, in the opposite direction
- 13. animals that bear live young that are nourished directly by the mother's body as they develop
- 14. type of fertilization in which eggs are fertilized outside of the body of the egg-producing individual
- 15. part of the amniotic egg that stores the waste produced by the embryo, and later fuses with the embryo
Down
- 1. species in which embryos develop in eggs outside a parent's body
- 2. stage in complete metamorphosis in which the larva develops into an adult
- 5. type of fertilization in which eggs are fertilized inside the body of the egg-producing individual
- 7. individuals can be both male and female or can convert from one sex to the other as they mature
- 9. egg composed of shell and membrane that creates a protected environment in which the embryo can develop out of water
- 10. species in which the embryo develops within the mother's body but depend entirely on the yolk sac of their eggs