waterproof fur webbed hind feet large, sharp teeth flat, wide tail
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Beavers build their homes in ponds and streams. Which characteristic is least critical to building homes in an aquatic environment?
Possibilities:
- waterproof fur
- webbed hind feet
- large, sharp teeth
- flat, wide tail

large, sharp teeth