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hypersensitivity to a substance that is usually harmless
a biological classification group (taxon) that is divided into families.
a molecule that is converted to adenosine triphosphate (ATP) for energy storage.
all the different ecosystems with their numerous and varied organisms.
coiled thread-like structures of DNA and histone, which is a protein, in the cell nucleus. They...
the tube that carries urine from the nephrons to the ureter via the renal pelvis.