Fat makes the polar bear large. Fat makes the polar bear slippery. Fat helps the polar bear run on ice. Fat helps the polar bear float in water.
I gave my students this multiple choice question: Polar bears are very heavy. About half of a polar bear's mass is fat. How does this adaptation most help a polar bear as it hunts in the Arctic Ocean?

Only one answer is correct among these 4 choices:
- Fat makes the polar bear large.
- Fat makes the polar bear slippery.
- Fat helps the polar bear run on ice.
- Fat helps the polar bear float in water.

Could you tell me which one is correct?

Fat helps the polar bear float in water.