The many finch species of the Galapagos Islands evolved from a single species that immigrated to the islands from the coast of South America. These species differ primarily in beak shape, which is closely related to the type of food each species specializes in eating. Which of the following best explains why each finch species on the Galapagos islands evolved to be specialists? A) Islands have limited food resources, forcing species to feed on a small range of food items.
b) Climate on islands tends to be less variable than on the mainland, minimizing seasonal absences of food.
c) Reduced Competition from other bird species allows finish species to focus on specific food resources.
d) Food resources on islands are more plentiful and nutrient rich than on the mainland, leading to specialist behaviors in feeding.