This response demonstrates a basic understanding of the question. The process is identified (Natural selection). Some possible steps are discussed (a group of iguanas were seperate from the other iguana because of a natural disaster; iguanas would begin to change & adapt to the new environment). The effects of rats, cats, and goats are explained (rats would eat both species eggs, decreasing potential population; the goat would eat much of the main food source for the land iguanas; Decreasing their population). Overall, the supporting details are adequate.
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