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the second biological classification group (taxon) that is divided into phyla (for animals) or divisions (for plants). There are five or six kingdoms in the main biological classification system.
regions in particular geographical locations with similar climates and vegetation types.
an atmospheric gas made of three oxygen molecules bonded together (O3).
any disease that is caused by a virus or a bacterium or any other micro-organism.
a cluster of capillaries situated inside Bowman's capsule in the nephron.
diet which contains all the nutrients needed by the body in the correct quantities and...