Across
- 2. The body of mammals is covered with...
- 4. Forelimbs od bird are modified into...
- 6. Help fish with locomotion
- 7. Covers the body of birds
- 10. Latin name of the class with simplest heart
Down
- 1. One reptile with four-chambered heart
- 3. Respiratory organ of mammals
- 5. They cover the body od fish
- 8. Adult amphibians breath through lungs and...
- 9. Respiratory organ of fish