Animals are divided in two major groups of(with spine) and(without spine). Mammals , birds, reptiles, fishes and amphibians are the mainmainly composed of insects , Arachnids (spiders, scorpions , mites etc.), mollusks (snails, octopus, squid etc.), crustacean (lobsters, crabs, shrimp etc.) and few others.Mammals and birds arethat can adjust their body temperatures according to their surroundings. All the other animals are. (are marine invertebrate animals that remain stationary under water. They build structures known as, made up of calcium carbonate, that act as an important housing place for many fish species and also protects coastlines by absorbing wave energy. Most of the animals appeared duringaround 540 million years ago in a span of just 20 to 25 million years. It is known asand it is a major event used by…