A keystone in an arch's crown secures the other stones in place. Keystone species play the same role in many ecological communities by maintaining the structure and integrity of the community.

A keystone species is a species that plays an essential role in the structure, functioning or productivity of a habitat or ecosystem at a defined level (habitat, soil, seed dispersal, etc).

US President-elect Joe Biden is to cancel the controversial Keystone XL Pipeline on his first day in office, North American media report. The pipeline is projected to carry oil nearly 1,200 miles ...

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The Central Bank of Nigeria (CBN) has reconstituted the board for Keystone Bank Limited as part of efforts to strengthen the lender’s operations. In a statement yesterday, Keystone Bank said ...