The majority of living things have some form of symmetry. Many mammals and fish have bi-symmetry, and anemones, starfish and jellyfish (among others) have radial symmetry. However, there usually are many small or major differences that make them not perfectly symmetrical. Is it possible for something to evolve to be 99% perfectly symmetrical, possibly even spherically?

Edit: I'm talking about something big, maybe as large as a cat or dog, not something tiny (ie. cocci bacteria).

  • $\begingroup$ Is there a specific scale you're interested in. Cocci bacteria are pretty spherical. $\endgroup$
    – canadianer
    Commented Feb 17, 2017 at 2:47
  • 1
    $\begingroup$ In short, no. As soon as you have a chambered heart, you have asymmetry. $\endgroup$
    – Asher F.
    Commented Feb 17, 2017 at 14:20
  • $\begingroup$ Perfect spherical symmetry is impossible (at least, cellular organelles aren't spherical) but some organisms are way more symmetric than us. A lot of bilaterians doesn't have large asymmetrical organs like our liver, stomach or hearth. $\endgroup$
    – Pere
    Commented Jan 26, 2019 at 23:45


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