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JAMB Biology 2005 Question 50

Question 50

Evolution

An evidence of a common ancestry for fishes, amphibians, reptiles, birds and mammals is the

  1. A.possession of wings by birds and bats
  2. B.cold-bloodedness of fishes, amphibians and reptiles
  3. C.presence of gill clefts in vertebrate embryos
  4. D.possession of scales by fishes and reptiles
Show the answer and explanation

Answer: C (presence of gill clefts in vertebrate embryos)

Explanation

All vertebrate embryos have gill clefts at an early stage. This shared feature suggests they came from a common fish-like ancestor.