10 free IB Biology practice questions in the real exam format, covering the official content areas, with an explanation for every answer.
IB Biology Practice Test 1Tutor mode
Question 1 of 10
Continuity and change
Lizards on an island vary in hind-limb length. After a hurricane, the surviving lizards had longer hind limbs on average than the original population. Which processes originally generated the heritable variation in hind-limb length on which this selection acted?