A research lab in San Francisco has built a robot that is able to walk, talk, and interact with humans. The robot is built of small bits of metal and plastic, which, when put together, create the circuits, pistons and support structures that organize the robot’s interior. These circuits, pistons and support structures are divided into a collection of working parts based on the jobs that they perform together. For example, some are information parts, some are signal parts, and some are movement parts. These collections of working parts are further organized into groups to perform a specific job related to a key task, such as moving the robot body. Together, all of the groups make the whole robot function in some ways like a living thing. What part of the robot is most similar to the organ level of a live human?

A: Small Bits
B: Circuits, Pistons, and Support Structures
C: Collections
D: Groups