Heart is an organ that critically plays an important role towards circulatory system.
In addition, Organs are grouped into organ systems, in which they work together to carry out a particular function for the organism. For example, the heart and the blood vessels make up the cardiovascular system.
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Answer:
A. Organ
Explanation:
Heart is an organ that critically plays an important role towards circulatory system.
In addition, Organs are grouped into organ systems, in which they work together to carry out a particular function for the organism. For example, the heart and the blood vessels make up the cardiovascular system.