Researchers Have Created a Robot That Has a Very Thin

Researchers have created a robot that has a very thin leg that is moved by cardiac (heart) cells contracting in unison. The robot, made of a polymer similar to that used in making contact lenses, is bathed in heart cells with supporting cells, which then attach to the robot and provide movement as they contract.
-The robot's cardiac cells, working together in synchrony, could be considered at what level in life's hierarchy of organization?

A) organism
B) organelle
C) tissue
D) organ system

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