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back	the backbone; spine. [1/10 definitions]
invertebrate	without a backbone [2 definitions]
shellfish	a small animal that lives in fresh or salt water and has a shell outside its body. Shellfish are not true fish. They are invertebrates, or animals with no backbone. People can eat many kinds of shellfish, including clams, oysters, shrimp, and lobsters.
spinal column	the row of bones that runs along the center of the back; spine; backbone. The bones of the spinal column are called vertebrae. The spinal column protects the nerves in the spinal cord.
spine	the backbone; spinal column. [1/3 definitions]
tail	the rear part of an animal's body that sticks out from the backbone. [1/7 definitions]
vertebrate	having a backbone. [2 definitions]
worm	an animal with a long, thin, round or flat body. Worms have no legs and move by creeping or crawling. Worms are invertebrates and have no backbone. [1/7 definitions]

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