After reading the paragraph below, answer the questions that follow.
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.
If the creators of the robot wanted to provide evidence that it is alive, which of the following properties would be best to use as evidence?
◦ The robot must be bathed in a liquid medium to provide nutrition for its cells.
◦ The robot has two different types of cells, fibroblasts and cardiac cells.
◦ New robots can be reproduced by researchers using the same manufacturing process.
◦ The robot can move.
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