Final answer:
An ROS is a methodical assessment of body systems, while tissues, organs, and organ systems are fundamental biological concepts.
Explanation:
Review of Systems (ROS) is an orderly and systematic check of each body system to assess overall health. This process involves questioning the patient to gather information about symptoms across different systems.
Tissues are groups of cells with similar structure and function, forming the basic building blocks of organs. Organs are made up of tissues working together to perform specific functions, while organ systems are groups of organs that work together to carry out complex physiological functions.
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