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two or more forms of a particular chemical element, that have the same number of protons in the nucleus but have different numbers of neutrons in the nucleus. The different possible versions of each element are called isotopes.
a crop consisting of one plant species which is cultivated over a large area.
a disease caused by the bacterium Vibriocholera, which produces a toxin in the lining of the...
the osmotic pressure that develops within the cells of a root system that causes the sap to rise...