C is the correct answer I think
They are a relatively recent invention.
I hope it was helpful for you.
1. A 2. B 5. B this is all I know hope it helps
Answer: Inclined plane, simple machine consisting of a sloping surface, used for raising heavy bodies. The force required to move an object up the incline is less than the weight being raised, discounting friction. The steeper the slope, or incline, the more nearly the required force approaches the actual weight.
Explanation:
A burning fossil fuels that produces energy
