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Mammals include 5000 species that range in size from mice to whales and that share characteristics, including  mammary glands, which produce milk to nourish young, and hair. Mammals breathe air, have four- chambered hearts, and are endotherms.

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A series of well- preserves ancient birds and feathered dinosaurs has “connected the dots” between modern birds and their dinosaur ancestors.

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Reptiles evolved from ancient amphibians with dry scaly skin, well- developed lungs, string limbs, and shelled eggs that do not develop in water, there are five groups of living reptiles: lizards and snakes, crocodilians, turtles and tortoises, the tuatara, and birds.

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This means “Double life” because most amphibians live in water as larvae but On land as adults.

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They have skeletons made of true bone. Most fishes alive today are bony fishes.

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Sharks, rays, and skates.

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An adult lamprey uses its teeth- filled mouth to attach to a host.

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Chordates consist 6 groups non-vertebrate chordates, fishes, amphibians, reptiles, birds, and mammals.

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The marine clase echinodermata includes  sea stars, sea urchins, and sand dollars.Adult echinoderms have spiny skin, five-part radial symmetry, an internal skeleton of calcium carbonate plates, and a network of water-filled tubes called a water vascular system. This water vascular system is used for walking and for gripping prey.

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Members of clase molusca, or mollusks, include snails, slugs, clams, squids, and octopi. Mollusks are soft- bodied animals that typically have an internal or external shell and complex organ systems.

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The clase annelida contains segmented worms such as earthworms and bloodsucking leeches. The name Anne,ida is derived from the Latin annellus, which means “little ring,” referring to the rung,Ike appearance of their body segments.

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Members of clase Platyhelminthes, or flatworms, include planarians, tapeworms, and flukes. Flatworms are soft, flattened, unsegmented worms that lack a coelom and an anus.

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The roundworms, or nematodes, are un segmented worms with specialized tissues and organ systems, and digestive tracts with two openings- a mouth and an abyss, some are free-living and live in soil or water. Others are parasites that infect plants and animals.

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Members of the clase Arthropoda include spiders, centipedes, insects, and crustaceans, arthropods have segmented bodies, a tough external skeleton, cephalization, and jointed appendages. At the least a million species have been identified- more that three times the number of all other animal species combined!

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Jellyfishes, sea fans, sea anemones, hydras, and aquatic, mostly soft-bodied, carnivorous, radially symmetrical animals with stinging tentacles arranged in circles around their mouths some, such as corals, have skeletons. Some live as independent individuals, while others live in colonies.

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Members of the clase Porifera, Latin for “pore bearers,” because they have tiny openings, of pores, all over their bodies. Sponges are among the simplest organisms in the clase metazoa, with all other multicellular animals.

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Concentration of sense organs and nerve cells at the anterior end of an animal

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Body cavity lined with mesoderm

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Body plan in which a single imaginary line can divide the body into left and right sides that are mirror images of each other.

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Body plan in which any number of imaginary planes drawn through the center of the body could divide it into equal halves.