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Cnidarians have specialized stinging cells called cnidocytes
Some male birds and mammals congregate in communal courting grounds called leks.
Cerebral angiography. The four angiograms each reveal the distribution of blood vessels supplying th
Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called
The approval of a new drug is a four-stage process: (1) preclinical investigation, (2) clinical inve
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