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primitive type of fish that lives very deep underwater and has four leg-like fins. It is thought to be closely related to the ancestor of the first amphibians.
the U-shaped part of the nephron tubule situated between the proximal and distal convoluted...
potentially lethal disease in humans and grazing animals such as cows and sheep. The disease is...
animal wastes (particularly urine) that contain materials high in nitrogen.
a general term form any plant diseases caused by different bacteria and fungi.