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the bone-like substance beneath the enamel of the tooth.
an atmospheric gas made of three oxygen molecules bonded together (O3).
reproductive or sex cells that contain the haploid set of chromosomes. The male gametes are...
a group or category in the biological classification system (the plural of taxon is taxa).
the breakdown of food into smaller pieces by chewing and peristalsis.
a plant body consisting of one or more cells. It is not differentiated into root, stem and...