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is one-millionth of a metre or one-thousandth of a millimetre (0,001 mm). Its unit symbol in the International System of Units (SI) is µm.
a small, circular opening in the exoskeleton of insects that allows air to enter the insect's...
small ball of chewed food mixed with saliva that is formed in the mouth, which is swallowed.
water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.
the tube that carries urine from the nephrons to the ureter via the renal pelvis.