This response demonstrates a good understanding of the question. The process is identified (natural selection). Several details are provided about the steps of the process (food was scarce; adapations on the limbs to help the marine iguanas move more effectively; teeth would gradually change; iguanas that are not very well adapted to the ocean gradually die out; gene pool that produces these slight adapations more and more frequent). The discussion of the effects of rats, cats, and goats demonstrates synthesis and includes a common effect on both species (the rats and cats feed on the eggs and young iguanas of both species) and an effect unique to each (the goats would diminish their food supply [cacti] but not the algae). Overall, the supporting details are generally complete.
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