I hope you see that eye level for you looking straight ahead while standing on the street is not the same eye level as the person standing on the 100th floor of a building. Who can see farther? Why?1. Eye level is straight ahead.
2. Exactly, they both fall at the same speed. They both are more dense than the atmosphere so they fall back down. At the same speed. It's the density itself. I've heard other theories where "gravity" exists but is dictated by temperature. I'm not sold on that, but it makes more sense than Newton's Star Wars force.
Why didn't you answer the question about the humans? Here it is again for you: Let's say you have two humans with the same density, one is 6' tall and the other is 4' tall, do they weigh the same? Why or why not?