<span>Leonardo da Vinci is the Renaissance man responsible for the ornithopter. The ornithopter is a type of aircraft whose wings flap, causing it to fly. This format mimics the natural motion of animals that fly (like bats and birds). </span>
Answer: A They were to expensive to produce.
Explanation:
Hi first of all is this a part of your assignment and I don't know but I'm still going to answer cause you got like no info because it was the right thing to do
To allow American merchant ships to access war zones
