The answer would be a references page.
Answer:
1. Since the 1700's, people have used balloons filled with gas lighter than air to float above the ground.
2. Inventors have been trying since as early as the 1800s to create a heavier-than-air machine that would fly.
3. Originally the machines were not meant to carry people.
4. Wilbur and Orville Wright were the first to fly a powered airplane in sustained height.
5. At Kitty Hawk, North Carolina, the flight lasted 12 seconds, and went 120 feet.
6. They succeeded, they had studies aerodynamics, the principles of the movement of air around objects.
7. From this beginning, the airplane industry was started.
8. Louis Bleriot, a Frenchman, was the first pilot to fly across the English Channel in 1909.
hope this helps! :)
A dependent Clause is a group of words, that have a subject and a verb, but cannot stand alone in a sentence. So, "<span>who had seen the tornado himself" seems most logical to me because they state subject and verb, and cannot stand alone.</span>
