Inches are part of the English system and centimeters are part of the metric system.
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Ligaments are part of the muscular system.
The clitellum is a part of the earthworm's reproductive system. It is the part of the worm that makes the egg cocoon.
The cadiovascular system, sometimes called the circulatory system when it includes the lymphatic system.
Circulatory system and Cardiovascular system
Cardiovascular system