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JAMB Biology 2005 Question 12

Question 12

Evolution

The transition from amphibians to mammals involves the limbs becoming arranged to support the weight more effectively requiring modifications in the

  1. A.collar bones and coccyx
  2. B.pectoral and pelvic girdles
  3. C.scapulae and clavicles
  4. D.vertebrae and sternum
Show the answer and explanation

Answer: B (pectoral and pelvic girdles)

Explanation

The limbs are attached to the body by the pectoral (shoulder) and pelvic (hip) girdles. These had to change so the legs could hold the body up off the ground.