It is designed to move with a motor. It is constructed from machine-made parts. It is made of more than one simple machine. It is built from more than one type of material.
I gave my students this multiple choice question: Which of the following statements best describes a complex machine?

Only one answer is correct among these 4 choices:
- It is designed to move with a motor.
- It is constructed from machine-made parts.
- It is made of more than one simple machine.
- It is built from more than one type of material.

Could you tell me which one is correct?

It is made of more than one simple machine.