Across
- 3. Short period of time to develop in Mothers Body
- 5. Group of cells that secrete fluids
- 6. Give Birth to Young's who develop in uterus
- 8. An organ where the offsprings develop
- 9. Group Of reptilian Ancestors
- 10. The time in which the animal developes inside the uterus
Down
- 1. Mammals use to Nurse their Young
- 2. Aids the flow of oxygen into lungs
- 4. Nourishment of the offspring inside the uterus
- 7. Mammals that lay eggs