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

Do red legged frogs eat pond fish? Fire belly toads croak for what reasons? Is a red backed salamander a carnovore or a herbovore? How long can a toad live under water? Why do amphibians have exoskeletons? Why do Jonas and the audience feel uncomfortable at the start of this chapter the giver? How does a blue dart frog crossbreed? Which biome is located just south of the tundra biome? Are frogs abiotic? How do you tell a boy to a girl grasshopper? Can a snail survive cold temperatures? Which is the thickest chamber of a frog? Cuales son los organos del sistema renal? Name some things that changes from green to yellow? How are the legs of grasshoppers adapted to the environment it lives in? How does a tadpole differ from an adult frog? Are snails dangerous to human touch? Are all frogs safe to eat? How old is the worlds oldest salamander? What are adaptations of a salamander?