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(also called an extinction event) the sudden dying out of large number of species over a short period of geological time.
(also called pith rays) sections of the medulla that occur between the vascular bundles.
organisms, such as plants, which are able to produce their own organic foodstuffs from inorganic...
undifferentiated mass of tissues that forms when small pieces of the parent plant, called...
moulds that generally infect the leaves of many plants, including crop plants, such as wheat and...