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What is the first supercontinent recognized with some certainty, and when did it begin fragmenting?
Left Ventricle
The chamber of the heart responsible for pumping oxygenated blood to the body.
Mitral Valve
A valve in the heart that lies between the left atrium and the left ventricle, regulating blood flow.
Veins
Blood vessels that carry blood towards the heart, as opposed to arteries which carry blood away from the heart.
Arteries
Arteries are the vessels responsible for transporting blood enriched with oxygen from the heart to the rest of the body.
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