The document discusses the main types of vertebrates: mammals, reptiles, fish, birds, and amphibians. It provides 3 key features for each group: mammals have hair, specialized teeth, and secrete milk from mammary glands; reptiles have scaly skin, lungs, and a partially separated heart; fish have fins, come in many species, and are important as food; birds have hollow bones, one seasonal ovary, and strong breast muscles; amphibians have moist skin, lay eggs in water or within the mother's body.

1. Vertebrates

2. Types of Vertebrates Amphibians Mammals Birds Fish Reptiles Birds Mammals Mammals Mammals Amphibians Amphibians Reptiles Mammals Mammals Amphibians Fish Birds Reptiles

3. Mammals

4. Features milk secreted from mammary glands hair; conserves body heat permitting even tiny mammals to be warm-blooded . teeth specialized for cutting (incisors), tearing (canines) and grinding (molars) their food . about 4,600 species living today .

5. Reptiles

6. Features a dry, water-impermeable skin lungs inflated by expansion of the rib cage a partial septum in the ventricle reducing the mixing of oxygenated and deoxygenated blood

7. Fish

8. Features Their fins are thin and supported by spines. There are some 25,000 species. They are an important part of the human diet in many areas of the world and, in affluent nations, support a large sports fishing industry.

9. Birds

10. Features hollow bones a single gonad (in females), which becomes enlarged and active only during the breeding season no teeth (their function is replaced by the gizzard) powerful breast muscles attached to an enlarged sternum

11. Amphibians

12. Features their skin is soft and moist so they are at risk of desiccation in dry surroundings . their eggs have no waterproof covering so… they must be laid in water placed within the mother's body

13. The End