Animals are classified on the basis of which of the following features?
$I$. Coelomic cavity
$II$. Level of organisation
$III$. Notochord
$IV$. Skeletal structure

  • A
    $I$ and $II$
  • B
    $I$ and $III$
  • C
    $I, II$ and $III$
  • D
    $II$ and $IV$

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