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  • Estimating How Many Species Humans Have Driven to Extinction
    This led them to estimate 150 to 260 extinctions a year for every million species on Earth (E MSY) However, after looking at other wildlife groups like amphibians and birds, the numbers varied wildly Eventually, they noted a sweet spot “They tend to cluster around about 100 [E MSY],” Cowie said
  • Thousands of Tree Species Remain Unknown to Science
    The study’s authors used these databases to calculate that there are approximately 64,100 known tree species on the planet—up from previous estimates of around 60,000
  • Historical and projected future range sizes of the world’s . . .
    a Estimated changes in range sizes between 1700 and 2016, relative to potential natural ranges in 1850 (which are based only on the natural biome distribution and assume no land use; ‘Methods
  • How many T. rexes were there? Billions | ScienceDaily
    Then, estimating that the total geographic range of T rex was about 2 3 million square kilometers, and that the species survived for roughly 2 1 2 million years, they calculated a standing
  • 3. 7. 4 POPULATIONS IN ECOSYTEM EXAM QUESTIONS - Quizlet
    Study with Quizlet and memorise flashcards containing terms like Describe the effect of an increase in the number of newts on the percentage survival of the tadpoles of each of the toad species [2], Suggest an explanation for the effect of an increase in the number of newts on the percentage survival of the tadpoles of spring peeper frogs [2], Using the information provided in Figure 1
  • Inferring global species richness from megatransect data and . . .
    Cryptic species (i e , species that are morphologically indistinguishable) might drastically elevate species richness estimates (e g , Mutanen et al , 2013; Brehm et al , 2016; Larsen et al , 2017), but preliminary data on pholcid spiders suggest that cryptic species in this group are the exception rather than the rule (Astrin et al , 2006
  • Whales Are the Biggest Animals to Ever Exist—Why Aren’t They . . .
    At around 100 feet long and 100 tons in size, these marine giants are the largest creatures—dead or alive—known to humankind Whales evolved from terrestrial ancestors that were dog-sized and





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