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Some male birds and mammals congregate in communal courting grounds called leks.
Reindeer antlers grow again each year under a layer of fur called velvet. This reindeer is losing th
Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called
The melting of glaciers and ice sheets is making an increasing contribution
A Gaucher cell showing accumulated fat stored in structures called lysosomes
Cancer cells can move to new locations in the body, a process called metastasis