Two or more specialized cells that are grouped together - Tissues, Two or more tissues that are grouped together - Organs, Two or more organs working together - Organ System, Connect, support, bind, or separates other tissues or organs - Connective Tissue, Thin tissue that covers all the exposed surfaces of the body - Epithelial Tissue, The main component of the nervous system - cells in this system communicate with each other through electrical signals - Nerve Tissue, Soft tissue that contracts and helps an organism move - Muscle Tissue, Facilitates gas exchange between the organism (and its cells) and the environment - Respiratory System, Ingests food and breaks it down into usable nutrients before excreting solid waste products - Digestive System, Responsible for the transport of materials throughout the body - Cardiovascular/Circulatory System,

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