Final answer:
Rabbits lack footpads on the bottom of their feet, unlike many other mammals. Instead, they have thick fur which provides protection and aids in silent movement.
Step-by-step explanation:
As compared to other mammals, rabbits have no footpads on the bottom of their feet. The correct answer to this question is b) Footpads. Other mammals typically have footpads which provide cushioning and protection while walking and running. However, rabbits have thick fur on the bottoms of their feet instead, which acts as a natural protector and helps them move silently.