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  • topic 3. 2: origins of biodiversity - AMAZING WORLD OF SCIENCE . . .
    be based on natural events and processes that are shown to have occurred around the time of extinction Two of the hypotheses put forward are: the impact theory of extinction; massive volcanic activity; Impact event; Between 1 4 and 1 8 million species have been described and named The number of species alive on Earth is ever changing
  • Food and Agriculture Organization
    Food and Agriculture Organization
  • Deforestation: Facts about the widespread destruction of . . .
    Planet Earth 'It's like trying to grow a tree in Humans have cleared around 386,000 square miles of forest in the Amazon since 1978 Facts about extraterrestrial life and how scientists
  • Accelerated modern human–induced species losses: Entering the . . .
    Therefore, although biologists cannot say precisely how many species there are, or exactly how many have gone extinct in any time interval, we can confidently conclude that modern extinction rates are exceptionally high, that they are increasing, and that they suggest a mass extinction under way—the sixth of its kind in Earth’s 4 5 billion
  • Evolution of birds - Wikipedia
    The basal bird Archaeopteryx, from the Jurassic, is well known as one of the first "missing links" to be found in support of evolution in the late 19th century Though it is not considered a direct ancestor of modern birds, it gives a fair representation of how flight evolved and how the very first bird might have looked
  • 1. 3 Classification of Organisms – Introduction to Human Biology
    The Diversity of Life In the 18th century, a scientist named Carl Linnaeus first proposed organizing the known species of organisms into a hierarchical taxonomy In this system, species that are most similar to each other are put together within a grouping known as a genus
  • Animal biodiversity: An outline of higher-level . . . - PubMed
    The kingdom Animalia is here estimated to have a total of 1,659,420 described species (including 133,692 fossil species) in 40 phyla Among these, the most successful phylum Arthropoda alone represents 1,302,809 species, or about 78 5% of the total The second largest phylum, Mollusca (118,061 speci …





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