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BIOLOGY

JAMB 2005 - Question 50

Biology 2005 JAMB Past Questions - Question 50: An evidence of a common ancestry for fishes, amphibians, reptiles, birds and mammals is the

Choose the most appropriate option for the gap .

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

A: possession of wings by birds and bats

B: cold-bloodedness of fishes, amphibians and reptiles

C: presence of gill clefts in vertebrate embryos

D: possession of scales by fishes and reptiles

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Correct Answer

Explanation

CEmbryology which is one of the of evidences in favour of evolution shows that the early embryos of all land vertebrates (Pisces, amphibians, reptiles, birds and mammals) pass through a gill slit stage. this makes them to resemble fishes that have permanent gill slits. the embryos also have tails at certain stages of their development of these embryological features shows that all vertebrates have a common ancestors.