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the osmotic pressure that develops within the cells of a root system that causes the sap to rise up through a plant stem to the leaves.
a blood vessel that returns oxygenated blood from the lungs to the left atrium of the heart.
kingdom of multicellular eukaryotic organisms that do not have cell walls, feed...
organisms that feed on dead organic matter and thereby release nutrients back into the soil.
the inner body tissue layer that forms the gut and other internal organs.