The author of the passage states that "the world’s understanding of the geographical distribution of mixopterids has been dramatically expanded" by the discovery of a fossil mixopterid, *Terropterus xiushanensis*, in the paleocontinent of Gondwana. The author claims that previous fossil evidence of mixopterids was found only in the paleocontinent of Laurussia. What is the main idea of the passage?
The discovery of the *Terropterus xiushanensis* fossil is significant because it
Correct answer: B
Explanation
The passage focuses on the fact that the *Terropterus xiushanensis* fossil was found in Gondwana, a paleocontinent where no mixopterid fossils had been previously found. This expanded understanding of mixopterid distribution is the main idea of the passage.
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