Answer:
Jill imagines as Pill bugs will not be able to move if he places hurdles in its way.
Step-by-step explanation:
Pill bug are the creature with flat shells and extended legs. They move after analyzing their environment through their antenna. These antenna helps the pill bug to sense the environment and move towards the clean path. They move quickly with the help of their legs. Jill experiments the movement of pill bug so he will analyse its movement and observe the affects that different materials will have on its movement.