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the tube through which urine passes from the kidney to the bladder.
bead-shaped proteins that occur in chromosomes.
(also called radioactive dating) a method of measuring the age of fossils based on how much...
a large oxygen-carrying protein (blood pigment).
the loss of water droplets from the hydathodes on the leaf margin.
animals that live socially or in colonies and perform certain tasks for the good of the colony...