In the given chart,what do $a$ and $b$ represent respectively?
$(i)$ Acoelomate
$(ii)$ Hemichordata
$(iii)$ Agnatha
$(iv)$ Pseudocoelomate
$(v)$ Gnathostomata
$(vi)$ Cephalochordata

  • A
    $(i)$ and $(iv)$
  • B
    $(iii)$ and $(v)$
  • C
    $(ii)$ and $(vi)$
  • D
    $(i)$ and $(ii)$

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