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Thread: Why is symmetry such a dominent characteristic throughout the evolution of life?

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    Why is symmetry such a dominent characteristic throughout the evolution of life?

    There seems to be almost every physical form of life imaginable, but yet they all share this common feature. I can't even begin to wonder why this is. But I don't know very much about biology, so I shouldn't be too frustrated.

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    Quote Originally Posted by ryan View Post
    There seems to be almost every physical form of life imaginable, but yet they all share this common feature. I can't even begin to wonder why this is. But I don't know very much about biology, so I shouldn't be too frustrated.
    It it the best design for movement.

    Trees are not symmetrical.

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    Quote Originally Posted by untermensche View Post
    Quote Originally Posted by ryan View Post
    There seems to be almost every physical form of life imaginable, but yet they all share this common feature. I can't even begin to wonder why this is. But I don't know very much about biology, so I shouldn't be too frustrated.
    It it the best design for movement.

    Trees are not symmetrical.
    The liver, heart, spleen, pancreas, etc. are not symemtrical either. Apparently there is no advantage for symmetry internally, supporting the idea that is an advantage externally only.

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    Snail organs are arranged to put the vital stuff inside the shell, not bilaterally symmetrical.
    What's odd is slugs have the same arrangment, vital organs placed for the protection of a shell they've lost.

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    Quote Originally Posted by Artemus View Post
    Quote Originally Posted by untermensche View Post
    It it the best design for movement.

    Trees are not symmetrical.
    The liver, heart, spleen, pancreas, etc. are not symemtrical either. Apparently there is no advantage for symmetry internally, supporting the idea that is an advantage externally only.
    I mean movement of the whole animal.

    Look at our vehicles. Symmetrical.

    Bilateral symmetry is a design that makes movement efficient.

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    Quote Originally Posted by untermensche View Post
    Quote Originally Posted by ryan View Post
    There seems to be almost every physical form of life imaginable, but yet they all share this common feature. I can't even begin to wonder why this is. But I don't know very much about biology, so I shouldn't be too frustrated.
    It it the best design for movement.

    Trees are not symmetrical.
    Thanks, it's better than anything I could come up with.

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    Quote Originally Posted by ryan View Post
    Quote Originally Posted by untermensche View Post
    It it the best design for movement.

    Trees are not symmetrical.
    Thanks, it's better than anything I could come up with.
    I got it from Stephen Jay Gould.

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    Quote Originally Posted by untermensche View Post
    Quote Originally Posted by Artemus View Post
    The liver, heart, spleen, pancreas, etc. are not symemtrical either. Apparently there is no advantage for symmetry internally, supporting the idea that is an advantage externally only.
    I mean movement of the whole animal.

    Look at our vehicles. Symmetrical.

    Bilateral symmetry is a design that makes movement efficient.
    I was agreeing with you. External symmetry for movement, but internally there is no advantage (provided that the mass is distributed symmetrically).

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    Quote Originally Posted by Artemus View Post
    Quote Originally Posted by untermensche View Post
    I mean movement of the whole animal.

    Look at our vehicles. Symmetrical.

    Bilateral symmetry is a design that makes movement efficient.
    I was agreeing with you. External symmetry for movement, but internally there is no advantage (provided that the mass is distributed symmetrically).
    I wasn't sure. I thought maybe you were thinking of movement of another kind. But I agree with everything you say.

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    http://www.fossilmuseum.net/Paleobio...ianFossils.htm
    Would not chemistry of early life favor symmetry.

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