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Age of invertebrates

資料來源 : Webster's Revised Unabridged Dictionary (1913)

Invertebrate \In*ver"te*brate\, a. (Zo["o]l.)
   Destitute of a backbone; having no vertebr[ae]; of or
   pertaining to the Invertebrata. -- n. One of the
   Invertebrata.

   {Age of invertebrates}. See {Age}, and {Silurian}.
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