Why do Pisces reptilian and amphibians have 2 or 3-chambered heart?

Are frogs found in a pod? What do tadpoles used to swim? What color is grayish brown? What does it mean when you spit blue? Do blue poison dart frogs hibernate or migrate? How does bat guano benefit plant growth? Are vamiers real? What is a new vampire called? How can you tell if a grasshopper is a baby? Does axolotls have fur or hair? What page is amphibious in hatchet? Are tourtoise repiles or amphibians? Does toad have a short a sound in it? What color is bright purplish-red? Does cotyledon provides food for the growing embryo? Animals with segmented body without legs? What important facts about the climate of aquatic biome? Can a poison frog kill you? What is the speed of a banana slug? Does frog have a short or long vowel sound?