Match the following columns and select the correct option:
$(a)$ $6-15$ pairs of gill slits $(i)$ $Trygon$
$(b)$ Heterocercal caudal fin $(ii)$ $Petromyzon$
$(c)$ Air bladder $(iii)$ $Chondrichthyes$
$(d)$ Poison sting $(iv)$ $Osteichthyes$

$(a)\quad (b)\quad (c)\quad (d)$

  • A
    $(ii)\quad (iii)\quad (iv)\quad (i)$
  • B
    $(iii)\quad (iv)\quad (i)\quad (ii)$
  • C
    $(iv)\quad (ii)\quad (iii)\quad (i)$
  • D
    $(i)\quad (iv)\quad (iii)\quad (ii)$

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List the phyla in the correct order of their placement in classification:
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$II$. Annelida
$III$. Arthropoda
$IV$. Platyhelminthes
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$VI$. Aschelminthes

Provide a comparative outline of the main characteristics of each phylum in the Animal Kingdom.

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