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

"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.
"The lion approached rapidly, roaring loudly and with its tail slashing the air angrily." The descriptive language would be avoided in a research paper; it would be more suited to a novel or nonfiction adventure story.
"Dr. Prathik has admirably dedicated over 30 years to the study of fossils, traveling to the most remote corners of the globe with little regard for his own comfort, and we have to commend him for his efforts." The 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.
"I was amazed to find the wolves not only unfazed by my presence but at times—I could have sworn—amused by my clumsy attempts to remain unnoticed." The use of the personal pronoun "I," as well as the casual language, would be unlikely to occur in an academic research paper.