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refers to any variation in the nucleotides, genes, chromosomes, or whole genomes of organisms.
the blood vessel that carries blood from the digestive tract to the liver.
simple epithelium with elongated, cells that lines the stomach, small intestine, urethra, vas...
a form of potential energy stored in chemical bonds and released in a chemical reaction.
a sac-like structure in plant cells that contains the cell sap. It supports the cell and helps...