Question

as lestyn barr and his team of researchers discovered when establishing the glacial timeline of antarctica, the transantarctic mountains—a 3,500 - km mountain range spanning the continent—are home to glaciers of at least 60 million years in age. researchers concluded, antarctica had glaciers long before the formation of its continent - wide ice sheet 34 million years ago. which choice completes the text with the most logical transition? a. thus, b. by contrast, c. even so, d. nevertheless,

Explanation:

The text is about the discovery of glaciers in Antarctica. The key is to find the most logical transition word. "Thus" is used for a conclusion. "By contrast" is for showing differences. "Even so" is for a concession. "Nevertheless" is for a contrast where the second part is still true despite the first. Here, the first part is about the formation of the continent - wide ice sheet 34 million years ago, and the second part is that Antarctica had glaciers long before that. So "Nevertheless" (D) shows the contrast that despite the ice - sheet formation time, glaciers existed earlier.

Answer:

D. Nevertheless