40. Mammals Placentals Monotremes Marsupials Embryo develops In a uterus Lay eggs Have a pouch Placenta provides Nutrients to embryo Only live in Australia and Neighboring islands Young born before Fully developed Contains amnion like bird and reptile eggs Mixture of reptilian And mammalian characteristics Most live in Australia and Neighboring Islands, except opossum 4,200 species Platypus and echidna Kangaroos Koalas Opossums Etc..
67. Reptiles Turtles and Tortoises Lizards and snakes Crocodilians Tuataras Hard shell Made of scutes Can be legless or Have limbs Alligators Crocs caimans Rare endangered Longest lived reptiles Snakes evolved From lizards Related to dinosaurs Different physical Characteristics Than lizards