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a molecule that is formed when oxygen and haemoglobin combine chemically.
(also called a glacial age) a long period of low temperature on Earth, during which large sheets...
the osmotic pressure that develops within the cells of a root system that causes the sap to rise...
a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the...
water-proof, waxy suberin-thickened layer on the radial and transverse cell walls of the...