Botany - Animal Kingdom Question with Solution | TestHub

Most of the members of class Chondrichthyes (cartilaginous fishes) are viviparous, while those belonging to class Osteichthyes (bony fishes) are oviparous. Amphibians cannot maintain a constant internal temperature (poikilothermic), while mammals can maintain a constant internal temperature (homeothermic). Amphibians have a three-chambered heart, while birds have a four-chambered heart. Both birds and reptiles have internal fertilization.