Which of the following is $NOT$ an exoskeleton of vertebrates?

  • A
    Calcium carbonate plates
  • B
    Feathers
  • C
    Hooves
  • D
    Nails

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"All vertebrates are chordates but all chordates are not vertebrates". Justify the statement.

Protochordates lack which of the following?

Urochordata: All the members of this subphylum are:

The group $Amniota$ includes:

Differentiate between Non-Chordata and Chordata.

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