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to be unable to breathe, or to have a lack of oxygen.
process by which cells become specialised to perform a specific function.
biological classification group (taxon) that is divided into species (the plural of genus is...
a form of asexual reproduction. It is an unequal cell division, in which a small cell forms...
small solid particles of matter such as soot, ash, metal and dust.
the process of removing salt and other minerals from seawater, to make it drinkable.