PT148.S4.Q25 > Question

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The scientist hypothesizes that the iguanas’ ancestors reached the islands near Australia by rafting from the Americas. As support, he points out that the only closely related species that currently exist are located in the Americas. He also notes that the islands first formed in isolation, away from any land masses, which implies that species could only exist there now if their ancestors had somehow arrived from elsewhere.

The scientist assumes that the closely related species in the Americas have the same ancestor as the island iguanas. He further assumes that this common ancestor has only ever lived in the Americas and nowhere else.

The argument is only concerned with the origins of the iguana species. The potential origins of any other species are irrelevant.

The scientist doesn’t suggest or assume that the island iguanas are the same species as the American ones. His argument is that they merely share the same ancestor, and that this ancestor rafted from America to the islands. They may have evolved differently since that ancestor.

That documented cases are uncommon does not mean that this situation was impossible or even unlikely at the time.

This suggests that the island iguanas’ ancestor may have arrived from Australia, rather than from the Americas.

The argument is only concerned with the origins of the island’s iguana species. The potential origins of other species in other locations are irrelevant.

PrepTest 148 - Section 4 - Question 25

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