Final answer:
Tortoises with saddle-shaped shells can reach vegetation above their heads, while tortoises with dome-shaped shells cannot. Therefore, the vegetation on the large and small islands would differ in terms of height from the ground.
Step-by-step explanation:
Tortoises with saddle-shaped shells can reach vegetation above their heads, while tortoises with dome-shaped shells cannot. Therefore, on the large islands where tortoises with saddle-shaped shells live, you would expect to find vegetation with leaves located higher above the ground. On the small islands where tortoises with dome-shaped shells live, the vegetation would be closer to the ground, with leaves growing farther above the ground.