Anyone may do so
It depends if they eat or drink but eventually they would get tired and collapse on the floor.
As a structural engineer, I would rather be on the second floor. Ask yourself this: Would I rather be under a bridge or on the bridge when it collapsed? The people in Michigan who rode the bridge down survived because the bridge did not fall as if dropped out of the sky. Part of the bridge "cushioned" the fall.
China will not collapse. If it did the world would collapse too
Yes, the trachea would likely collapse when exhaling if there were no rings of cartilage in its walls. The cartilage helps to maintain the structure and prevent collapse, ensuring the airway remains open for the passage of air during both inhalation and exhalation.
Sometimes, buildings weakened by an earthquake, then it would collapse during a aftershock.
The bottom floor, most likely, and some floors just above it. Up to about halfway, there was a decent chance of it happening.
Unlikely, as the weight of snow would possibly cause the legs of the gazebo to collapse
Collapse
The world would collapse.
The pyramid would collapse.
If the WTC towers did not collapse, they would eventually be due to the extensive damage beyond repair
When you stand on a floor you are being pulled down by gravity but are applying force only to one side of the floor. Air is also being pulled down by gravity but because it surround the floor it applies force equally on both sides of the floor making it appear as though there is no force at all. Think of an empty plastic milk jug. If you simply screw the cover on the top the shape will stay the same because there is equal air pressure inside and outside the jug. Now put a vacuum cleaner hose on the open top of the jug. The jug will collapse because the air pressure is now only being applied to one side of the jug wall. Getting back to the floor, if you sealed up the basement and were able to suck all of the air out, the pressure from the air in the living room (and all the air above it) would probably cause the floor to collapse in exactly the same way it would if you had too many people standing on it.