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- How long do most species last before going extinct? | Live . . .
For mammals, the average species exists for 1 million to 2 million years, according to an article in the journal People the planet
- Prehistoric Tegu Lizards Found in North America: New Species . . .
A 15-million-year-old vertebra fossil reveals that tegu lizards once naturally roamed North America during a prehistoric warm spell
- Ardipithecus ramidus - The Smithsonians Human Origins Program
Even though it has some ape-like features (as do many other early human species), it also has key human features including smaller diamond-shaped canines and some evidence of upright walking It may have descended from an earlier species of Ardipithecus that has been found in the same area of Ethiopia, Ardipithecus kadabba
- THE SIXTH EXTINCTION - Earth Matters
When working with extinction data, E MSY (extinctions per million species per year) is a widely-used metric referring to the number of extinctions per 10,000 species per 100 years A recent estimate asserts the natural, or ‘background,’ extinction rate is 2 E MSY
- Skull Fossil Suggests Simpler Human Lineage - The New York Times
An analysis of a 1 8-million-year-old skull suggests that early human ancestors may have been members of the same species, with diverse physical appearances
- How humans drive speciation as well as extinction - PMC
Both the total number of extant species, and the rate at which those species are disappearing, are highly uncertain [8 – 10] Approximately, 1 9 million species have been described [11] Estimates of the total number of eukaryotic species alive include 5 ± 3 million [10], 8 7 ± 1 3 million [12], less than a million and more than 10 million
- Biodiversity: Life – a status report : Nature News Comment
Studies that try to tally the number of species of animals, plants and fungi alive right now produce estimates that swing from less than 2 million to more than 50 million
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