Fish and amphibians share characteristics with all chordates, such as having a notochord and dorsal nerve cord. Reptiles evolved adaptations like scales, thick skin, and amniotic eggs to prevent water loss and live on land. Reptiles have three-chambered hearts and double-looped circulatory systems, and are ectothermic, maintaining their body temperature through their surroundings. Birds further adapted for land with feathers for flight, thin hollow bones, and the ability to regulate their own high body temperatures through panting and a high metabolism.

1. Warm up What characteristics are similar between fish and amphibians? What characteristic do both of these animal phyla share with all chordates?

2. REPTILES & Birds

3. PREVENT WATER LOSS to live on land… Dry, hard, plate-like scales Thick skin Amniotic egg Reptile Land Adaptations

5. Egg Comparison…

6. Atrium ventricle Reptile Circulatory System... three-chambered heart Double-looped circulatory system

7. ECTOTHERMIC -Must maintain body temp using surroundings Limitations of Reptiles...

9. Feathers for flight Different types for different jobs Bird Land Adaptations

10. Bones thin and hollow Amniotic egg ENDOTHERMIC High body temps (over 104 o F) High metabolism Pant to cool! Eat a lot

12. 4 Complete Heart Chambers Double-looped circulatory system

13. Bird Reptile