- Life Sciences
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...