Section: Science

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According to the passage, the Iguanodon can best be described as:

1. A mammal.
2. A loner reptilian.
3. A Herd-dwelling ornithischian that preferred cold weather.
4. A Herd-dwelling ornithischian.

Answer 4 is correct. Answers 3 and 4 are the only viable choices given what is known about the modern iguana, but 3 is disqualified for remarking that the creature preferred cold climates. (Note the "everywhere but Antarctica" reference.)