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a foreign substance, usually a protein, that stimulates the production of one or more antibodies. The foreign substance, which could be a virus, bacterium or toxin, can be from the external environment or from within the body.
a molecule that stores large amounts of energy that can be used for metabolic activity.
the seepage of acidic, contaminated water from disused mines and mine dumps.
refers to any variation in the nucleotides, genes, chromosomes, or whole genomes of organisms....