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epithelium with numerous layers of cells.
a small, circular opening in the exoskeleton of insects that allows air to enter the insect's...
is a medical condition in which excess body fat has accumulated to the extent that it may have...
nutrients are obtained by digesting organic compounds that have to be acquired and ingested by...
the outermost layer of the stele or vascular cylinder in a dicotyledonous plant root. Lateral...
competition between organisms of different species.