vertebrateanimal with a backboneamphibianA vertebrate whose body temperature is determined by the temperature of its environment, and that lives its early life in water and its adult life on land.reptileA vertebrate whose temperature is determined by the temperature of its environment, that has lungs and scaly skin, and that lays eggs on land.mass extinctionwhen many types of living things become extinct at the same timemammalA vertebrate whose body temperature is regulated by its internal heat, and that has skin covered with hair or fur and glands that produce milk to feed its young.
