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the adding of fluoride to public drinking water.
regions in particular geographical locations with similar climates and vegetation types.
(also called an extinction event) the sudden dying out of large number of species over a short...
a leaf with certain areas that lack chlorophyll. The leaf therefore contains both green and non-...
(also called primary meristems) meristems at the apex (tip) of stems and roots where primary...
the cavity used for transport purposes. It has one opening to the environment through which...