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Short "hint"

All animals having a two sided symmetry, i.e. they have a front and a back end, as well as an upside and downside

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Usage examples (10)
  • "bilateria," as they're called - could possibly move in a fashion that would leave such trails.
  • Also, there's evidence of bilateria 40 million years before the Cambrian.
  • As chordata is predated by bilateria, that would indicate that the evolutionary process is ongoing, not 'instantaneous'.
  • Dolphins and whales were classified into the same group as cows and behemoths, even hierarchy of all bilateria is now quite different from what it used to be 20 years ago.
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