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The heart and lungs are two examples of structures called A. Connective tissue B. Organ systems C. Epithelial tissue D. Organs
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The heart and lungs are two examples of structures called

A. Connective tissue
B. Organ systems
C. Epithelial tissue
D. Organs

User Nate Koppenhaver
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The heart and lungs are both Organs
User MRu
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