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JAMB Biology 2000 Question 5

Question 5

Evolution

The most recently evolved structure in animals is the

  1. A.hair
  2. B.cilium
  3. C.scale
  4. D.feather.
Show the answer and explanation

Answer: A (hair)

Explanation

Cilia occur in protozoa and scales in fishes, both ancient groups; hair is found only in mammals, which are treated as the most recently evolved animals.