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.

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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).

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The massive project was meant to span Canada and the US Within hours of taking office, President Joe Biden signed an executive order rescinding the permit for the Keystone XL pipeline. The move ...

Atletico Madrid defender Robin Le Normand suffered a traumatic brain injury following a collision of heads in Sunday’s Madrid derby. The Spain international was involved in the accidental ...