Across
- 1. Animals that regulate internal temperature
- 4. Protein that makes up mammal hair
- 6. Type of circulation involving lungs
- 7. Teeth used for grinding food
- 8. Covering found on all mammals
- 10. Animals that eat both plants and meat
- 13. Animals that give birth to live young
- 15. Group of egg-laying mammals
- 16. Sharp teeth used for stabbing
- 17. Air sacs in lungs for gas exchange
- 18. Organ that pumps blood through the body
- 19. Type of mammals with pouches
Down
- 2. Fluid mothers produce for offspring
- 3. Musclethat helps with breathing
- 5. Warm-blooded animals that maintain body temperature
- 9. Animals that eat insects
- 11. Teeth used for cutting and biting
- 12. Organ that nourishes unborn young
- 14. Organ system used for breathing
- 15. Egg-laying mammals (another term)