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the region of the kidney where the renal artery enters, and where the renal vein and the ureter leave the kidney.
the movement of respiratory gases across a respiratory surface.
the part of the atmosphere that contains the ozone layer and is about 10 km above the Earth's...
is one-millionth of a metre or one-thousandth of a millimetre (0,001 mm). Its unit symbol in the...
a person who does not eat animal flesh, but does usually include milk and eggs in their diet....
an alkaline watery fluid containing digestive enzymes, which is secreted into the mouth by...