Which of the following structures does not function as support in animals?

Which of the following structures does not function as support in animals?
  • A.
    Cuticle in arthropods
  • B.
    Scales in’ birds
  • C.
    Cartilage in mammals
  • D.
    Body fluid in earthworms
  • E.
    Bones in vertebrates
Correct Answer: Option B
Explanation
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