Because of gravity... if you want a more detailed answer look it up on google!
The answer is steamboats! The first steamboat came year 1807 and was invented by John Fitch:)
I believe the answer is either A or D. However, I think D sounds the most fitting but like i said, it could be either one. :)
Answer:
Please give the steps provided.
Explanation:
I will gladly answer your question in the comments
:)
