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

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

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Similar Questions

Assertion $A$: $Amphioxus$ is not a vertebrate.
Reason $R$: $Amphioxus$ is not a chordate.
Which option is correct for Assertion $A$ and Reason $R$?

Assertion : Acraniata is a group of organisms which do not have a distinct cranium.
Reason : It includes small marine forms without a head.

In which of the following is the notochord extended from head to tail region and is persistent throughout their life?

Which of the following distinguishes chordates from non-chordates?

In some chordates,the notochord is replaced by the vertebral column. Such animals are called vertebrates. Which one of the following statements is correct?

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