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Some male birds and mammals congregate in communal courting grounds called leks.
The pancreas. This organ sits just below the stomach and is both an exocrine and an endocrine gland.
Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called
The nucleus is bounded by a double membrane called the nuclear envelope
Cancer cells can move to new locations in the body, a process called metastasis
A commercially available DNA microarray, called a GeneChip, marketed by Affymetrix, Inc