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Angie50215 Angie50215
  • 21-05-2016
  • Biology
Answered

Why are such different animals as fish, amphibians, reptiles, birds, and mammals grouped into a single phylum?

Verified Answer :

Anonymous Anonymous
  • 21-05-2016

The simplest answer is that these all have a backbone/notochord and all have internal skeletons of some type,

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