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a substance produced during anaerobic respiration in animals.
a response of the body tissues to injury or irritation. It causes pain, swelling, redness and...
the excessive growth of algae in eutrophic streams, rivers and dams.
cup-shaped sac at the beginning of the nephron, which surrounds the glomerulus.
water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.