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the main vein that returns deoxygenated blood from the lower parts of the body to the right atrium of the heart.
the movement of an organism in response to a one-directional source of light when the stimulus...
animals that lack a cavity between the digestive tract and the outer body wall.
structure surrounding plan tcells i tgives cells rigidity and strength.
a small body of modified cardiac muscle cells in the upper right corner of the wall of the right...