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a timespan in the Earth's history. The sub-division of an era.
region of the kidney into which urine is discharged from the collecting ducts of the nephrons,...
the form in which excess glucose is stored in the liver and muscles of mammals.
a group of parasitic protozoa. There are several species of plasmodium that cause malaria in...
(SO2) a colourless gas that smells of rotten eggs or burnt matches and is produced by...