0:25 minutes
Problem 12
Textbook Question

Many species of animals on islands are larger than related species on the mainland. Scientists hypothesize that this phenomenon, called island gigantism, evolved in response to the scarcity of competitors and predators on islands. Reduced competition and predation allows species to exploit more resources and frees them from the need to hide in small refuges. Which tortoises, mainland or island, need to eat more food per gram of their body mass?

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