External Structures - Those parts on the outside of a body structure , Internal Structures - Those parts on the inside of a body or structure, Organ - A body part that is made of smaller parts that work together to do a certain job., Organ System - A group of organs that work together to do a job for the body. , Receptors - Special structures that send information about the environment from different parts of the body to the brain.  ,

Animal Vocabulary

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