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  • Mammals - Biological Diversity
    Mammals can be identified by the presence in females of mammary glands that produce milk for offspring Mammals are warm-blooded vertebrates with sweat glands, hair, three middle ear bones and a neocortex region in the brain Their gradual evolution from mammal-like “reptiles” called “synapsids” spanned about 70 million years
  • How do scientists know weve only discovered 14% of all . . .
    So then, estimating that there are about 50,000 species of canopy trees, he simply multiplied 160 x 50,000 to come up with 8 million Since it is relatively well known that beetles make up approximately 25% of all described species on Earth, he then multiplied 8 million x 4 to come up with 32 million
  • Climate change: 1 in 3 plant and animal species extinct in 50 . . .
    Take a moment to cherish your plants and appreciate the animals you see around you In 50 years, a third of them may no longer exist Using data from surveys that studied 538 animals, insects and
  • Mass extinction - Understanding Evolution
    Extinction is a recurring theme over the history of life on Earth Ninety-nine percent of species that have ever lived on Earth have gone extinct, 1 and more than one third of the plant and animal species alive today are threatened with extinction 2 Usually, extinction operates at a fairly constant rate, culling some species while speciation generates new ones
  • Species Statistics Aug 2019 - REPTILE DATABASE
    Note also that currently 908 reptile species have a total of 2,088 subspecies Some authors reject the idea of subspecies and either synonymize them with their parent species or consider them as valid species (e g Wallach et al 2014, Snakes of the World) Species Numbers by Higher Taxa:
  • It would take 23 million years for evolution to replace . . .
    It would take 23 million years for evolution to replace Madagascar's endangered mammals Date: January 10, 2023 Source: Field Museum Summary: 90% of the plants and animals on Madagascar are found
  • Half of the Species on Earth Could Go Extinct by 2050: Scientists
    Half of Earth's species could go extinct by 2050 unless humanity addresses man-made climate change, according to biologists There have been five mass extinctions in the history of planet Earth The most recent occurred 65 million years ago, when the dinosaurs famously bit the dust Now, studies suggest human beings are currently causing a sixth





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