PLEASE ANSWER what does when I heard the learn'd astronomer suggest about academic studies? A. that they tend to be impossibly complex B. that they reveal a wealth of information C. that they are rewarding for many people D. that they are overwhelmingly tedious​

d. tundra

Explanation:

Polar bears are present only in the Arctic tundra biome. The most important areas for polar bears in the arctic are are the edges of pack ice where the wind and water interact, which createsa constant refreezing and melting network of leads (open spaces in the sea ice) and ice patches.  

A polar bear has a fat layer under the skin that helps it stay warm and the big paws help a polar bear walk through the snow.

Hence, the correct option is D. Tundra.