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bone Your bones are the hard things inside your body that your muscles are attached to. The longest bones in your body are inside your legs and your arms. All your bones together are called your skeleton.
invertebrate An invertebrate is a kind of animal. Any animal that does not have a backbone or skeleton inside its body is called an invertebrate. Worms, insects, spiders, and crabs are some kinds of invertebrates.
mammal A mammal is any animal that has hair or fur on the outside of its body and a skeleton inside its body. Mammals are also different from other types of animals because they produce milk to feed their babies. Dogs, cows, horses, elephants, rabbits, and humans are some animals that are mammals.
skeleton A skeleton is the set of bones in your body or in an animal's body. There are 206 bones in the skeleton of an adult human.