Tortoises in the Galapagos possessed neck lengths unique to each island.Neck lengths appear to be an adaptation to which selective agent?
A) ease in finding pools of drinking water
B) type of vegetation available to eat
C) reproductive barriers used to produce offspring
D) defense against predators
E) male competition for females

Question

Quizplus · Accepted Answer

The neck lengths of tortoises in the Galapagos appear to be an adaptation to the type of vegetation available to eat on each island. Different islands have different types of vegetation, and tortoises with longer necks are able to reach higher to access more leaves, while those with shorter necks are restricted to lower vegetation. This indicates that the selective agent is the availability and type of vegetation.

Tortoises in the Galapagos Possessed Neck Lengths Unique to Each