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Transcript of Animal's
These are fish! cold blooded! Fish rule the oceans and freshwater of the world. They are the most common group of vertebrates (creatures with backbones), and were also the first vertebrates. Most species only live in fresh or salt water, but some that live in the ocean come into freshwater to spawn, and a few can live in either fresh or salt water.
Fish first arose about 540 million years ago
WHAT KIND OF ANIMALS? MAMMLAS REPTILES Reptiles are animals in the (Linnaean) class Reptilia characterized by breathing air, a "cold-blooded" (poikilothermic) metabolism, laying tough-shelled amniotic eggs (or retaining the same membrane system in species with live birth), and skin with scales or scutes. They are tetrapods (either having four limbs or being descended from four-limbed ancestors) and lay amniotic eggs, Amphibians (class Amphibia, from Amphi- meaning "on both sides" and -bios meaning "life"), such as frogs, toads, salamanders, newts, and caecilians, are ectothermic (or cold-blooded) animals that metamorphose from a juvenile water-breathing form, either to an adult air-breathing form, or to a paedomorph that retains some juvenile characteristics. Proteidae (mudpuppies and waterdogs) are good examples of paedomorphic species. Though amphibians typically have four limbs, the caecilians are notable for being limbless. Amphibian