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modified phloem parenchyma cells that help translocate food substances in the plant.
the blood vessel that carries blood from the liver to the inferior vena cava.
(also called polymers) large, more complex molecules formed when monomers join together.
movement of the Earth's continents as the Earth's tectonic plates shift.
muscle found only in the heart and forming the muscle wall (myocardium) of the heart.
all types of waste that pose a significant threat to people and the environment.