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A Primer on the Evolution of Animals

A Primer on the Evolution of Animals Animals are multicellular, living, breathing organisms in the Kingdom Animalia. With few exceptions, all animals eat raw organic matter, breathe air, can move, reproduce sexually, and secrete body heat. All vertebrates (izards, snakes, insects, birds) and most mollusks (starfish, snails, oysters, clams) belong to the class Bacteria. The […]