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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.
organisms that are unable to produce their own organic food and must therefore obtain nutrients...
a species that has a large effect on its environment relative to its abundance and plays an...
the main blood vessel that returns deoxygenated blood from the head and thorax to the right...
tissue that makes up the majority of the plant body and performs various functions.