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bone the hard tissue that forms the skeleton of a person or animal. [1/2 definitions]
cartilage a tough, white tissue that forms part of the skeleton of humans and other animals. Cartilage is not as stiff as bone. Cartilage is found in the ear, nose, and joints.
coral the hard skeleton of tiny sea animals called corals. Most kinds of corals live in warm tropical oceans, and their thousands of skeletons form reefs and atolls. [1/3 definitions]
hipbone the three joined bones that form one side of the skeleton from the upper thigh to the waist.
invertebrate an animal that does not have a backbone or skeleton inside its body. Insects, spiders, worms, snails, clams, crabs, and squids are some kinds of invertebrates. [1/2 definitions]
mammal a warm-blooded animal with fur or hair on its skin and a skeleton inside its body. Mammal mothers produce milk to feed their babies. Most mammals have four legs or two arms and two legs. Dogs, cows, elephants, mice, whales, and humans are all mammals.
ray2 a fish with a flat body and a skeleton made of cartilage. Rays have broad fins and long, narrow tails.
reptile a cold-blooded animal with a skeleton inside its body and dry scales or hard plates on its skin. Most reptiles lay eggs with soft, leathery shells. Some kinds of reptiles live in water, but use their noses to breathe air into their lungs. Lizards, turtles, snakes, and crocodiles are kinds of reptiles. Most reptiles have short legs, but snakes creep on the ground without legs.
shark1 a fish that lives in the ocean and has tough skin, large jaws and teeth, and a skeleton made of cartilage. Most sharks eat other fish.
skate2 a kind of fish that has a skeleton of cartilage, a flat body, fins that look like wings, and a pointed snout. Skates live along the western coast of the United States.
sponge the light skeleton of some kinds of sponge colonies. People harvest sponges after the animals die and then dry the skeletons. People use sponges for cleaning and bathing. [1/5 definitions]
vertebrate an animal that has a skeleton with a backbone inside its body. Mammals, birds, amphibians, reptiles, and fish are large groups of vertebrates. [1/2 definitions]