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produced when the liver breaks down old red blood cells
the tube that carries urine from the nephrons to the ureter via the renal pelvis.
the main vein that returns deoxygenated blood from the lower parts of the body to the right...
organisms, such as plants, which are able to produce their own organic foodstuffs from inorganic...
a very long time span in the Earth's history, covering tens or hundreds of millions of years....