Which choice best describes the function of the underlined sentence?
A
It offers an overview of the tools scientists use to examine fossils.
B
It describes a limitation of some studies about the origin of turtles.
C
It summarizes previous research on the evolution of crocodiles.
D
It criticizes a widely held belief about genetic studies of reptiles.
Explanation
Correct answer: B.
Choice B is the best answer. The sentence mentions that some fossil studies have relied on incomplete data sets, suggesting that these studies are limited in what they can tell us about turtles’ origins.
Why the other choices are wrong
Choice A
Choice A is incorrect. While the sentence mentions the incompleteness of the data sets studied, it doesn’t mention any tools or techniques used to examine fossils.
Choice C
Choice C is incorrect. The sentence doesn’t mention anything about the evolution of crocodiles.
Choice D
Choice D is incorrect. This sentence doesn’t directly mention or criticize any "widely held belief," and it focuses on a limitation of fossil studies of reptiles, not genetic studies.