A) What do these inventions all have in common?
They are all about technology and helps the human being to develop or get an easier life.
You have to describe the pictures and describe the similitudes you found between them.
B) What is their purpose?
Most of them were created to help the human to do tasks that they consider hard, or maybe they are just to have fun. It can be applied to different purposes.
Here is another answer that can help you understand better the purpose of inventions:
Inventions improve our lives in many ways. They make our tasks easier, entertain us, improve our knowledge of the world, and even save lives
C) How do they work?
They use technology just as satellites, electric circuits and antenas, that helps the machine to communicate or do whatever the person wants.
Look at the pictures and explained how this inventions works.
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