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Final answer:The word element card- is an example of a Root, typically referring to the heart in medical terms. It is the base used to form more complex medical terms like cardiology, which means the study of the heart. option D is correctExplanation:The word element card- is an example of a Root. In medical terminology, a root word is the base of a term that typically refers to a body part or system. For example, cardio- refers to the heart. The root can be used alone or combined with other elements to form complex medical terms. For instance, cardiology is a compound word where card- represents the heart and -logy refers to study, collectively meaning the study of the heart's function and diseases....