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Histories of life: tree, web and ring models

Discussion in 'The Living World' started by Jim, Aug 25, 2019.

  1. Jim

    Jim Nets of Wonder

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    Perspectives on the Phylogenetic Tree

    Three of the models currently being considered in research on the history of life are called “tree,” “web” and “ring.”

    Tree:

    8A76E085-5E95-4C07-A0BC-78DE9F8CB26F.png

    In tree models, all life on earth has one single common ancestor that lived almost four billion years ago. Two kinds of single-celled life forms evolved from that, Then multicellular life forms evolved from one or both of those.
     
    #1 Jim, Aug 25, 2019
    Last edited: Aug 25, 2019
  2. Jim

    Jim Nets of Wonder

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    Web:

    F5F878D3-AD3F-4EB8-A986-C56B900374F3.png

    In web models, some separate lines of ancestry go back to a diverse community of cells, instead of to a single organism.
     
    #2 Jim, Aug 25, 2019
    Last edited: Aug 25, 2019
  3. Jim

    Jim Nets of Wonder

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    Religion:
    learning to follow Baha'u'llah
    Ring:

    387233C6-12F1-4C5D-A546-ED2530A964E3.png

    In ring models, the community of cells is drawn as a ring, instead of a band at the bottom of a web.
     
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