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中铁陨石; 中陨铁

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  • Human Population Growth and Extinction - Biological Diversity
    Harvard biologist E O Wilson estimated that 30,000 species per year (or three species per hour) are being driven to extinction Compare this to the natural background rate of one extinction per million species per year, and you can see why scientists refer to it as a crisis unparalleled in human history
  • ScienceAlert : The Best in Science News And Amazing Breakthroughs
    The latest science news Publishing independent, fact-checked reporting on health, space, nature, technology, and the environment
  • Australopithecus sediba | Characteristics Facts | Britannica
    Using the size of the remains to estimate height, MH1 was thought to have stood approximately 1 3 metres (about 4 25 feet) tall Although MH1 was estimated to be only about 10–13 years old at the time of his death, researchers had enough information to determine that the level of sexual dimorphism (the differences in appearance between males and females of the same species) between MH1 and
  • Species - Wikipedia
    Species may then need to be distinguished by the boundary definitions used, and in such cases the names may be qualified with sensu stricto ("in the narrow sense") to denote usage in the exact meaning given by an author such as the person who named the species, while the antonym sensu lato ("in the broad sense") denotes a wider usage, for
  • Termite - Wikipedia
    The infraorder name Isoptera is derived from the Greek words iso (equal) and ptera (winged), which refers to the nearly equal size of the fore and hind wings [22] [citation needed] "Termite" derives from the Latin and Late Latin word termes ("woodworm, white ant"), altered by the influence of Latin terere ("to rub, wear, erode") from the earlier word tarmes
  • This 429 million-year-old trilobite eye is similar to those . . .
    The discovery of a species that lived 6 6 million years ago in southwestern China suggests that ancient otters had "wolf-like" proportions, and weighed roughly 100 Ibs The creature -- whose skull
  • Plate tectonics - Continental Drift, Subduction, Earthquakes . . .
    Mountain building associated with the formation of Pangea peaked at about 300 million years ago This episode was preceded by other mountain-building events peaking at 600 million to 650 million years ago and at 1 1, 1 6, 2 1, and 2 6 billion years ago Like Pangea, could these episodes represent times of supercontinent amalgamation?





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