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a molecule that is built up of two or more different elements that are chemically joined together in fixed proportions.
Linnaeus' two-part name system; the first name of the organism is the genus to which it belongs...
cellular respiration that takes place in the presence of free oxygen.
a structure that is used by molluscs for feeding. It is a minutely toothed, chitinous ribbon...
movement of the Earth's continents as the Earth's tectonic plates shift.
the destruction of a donated organ by the immune system of the recipient.