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Modern Mass Extinction
According to a 1998 survey of 400 biologists conducted by New York's American Museum of Natural History, nearly 70 percent ...
modern mass extinction
Prevent Extinction
One of the most important ways to help threatened plants and animals survive is to protect their habitats permanently ...
prevent extinction
Prehistoric Extinction
The greatest mass extinction of the last 500 million years or Phanerozoic Eon happened 250 million years ago, ending the Permian Period ...
prehistoric extinction
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Extinctions
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The Precambrian era was a period in earth history before the evolution of hard-bodied and complex organisms.read more...
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During the Cambrian period the world was largely covered by epeiric seas, and existing organisms were entirely marine.read more... |
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The Ordovician period was an era of extensive diversification and expansion of numerous marine clades.read more... |
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Following the Ordovician mass extinction rediversification of surviving groups occurred throughout the Silurian and Devonian.read more... |
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With the formation of the super-continent Pangea in the Permian, continental area exceeded that of oceanic area for the first time in geological history.read more... |
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Following the Permian mass extinction, life was abundant but there was a low diversity of species. read more... |
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