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Question:

Which of the following sentences might be found in an academic research paper on the evolution of mammals?

A (C) In all samples, the caudal vertebrae were found to be fused into a single bony structure that ranged in length from 7.8 to 9.1 centimeters.
Explaination

(C) In all samples, the caudal vertebrae were found to be fused into a single bony structure that ranged in length from 7.8 to 9.1 centimeters. The neutral tone, the use of the scientific term "samples" and the anatomical term "caudal vertebrae," and the range of precise measurements mean this sentence is appropriate for an academic research paper. Choice (A)'s descriptive language would be avoided in a research paper; it would be more suited to a novel or nonfiction adventure story. Choice (B)'s tone and language are more suited to a speech or an article written in tribute to the scientist; while it concerns his academic work, it does not report his research. Choice (D)'s use of the personal pronoun "I," as well as the casual language, would be unlikely to occur in an academic research paper.