People didn't know that flys came from maggots of that frogs came from tadpoles so they thought that things magicaly appeared. This is called Spontanius Generation. So really everybody believed all things were constructed from air.
All living things need air!
the air
All machines are constructed from six simple machines
Yes, a triangle can be constructed if all sides are given.
It is believed that the air elements (Aquarius, Gemini, Libra) are believed to be the least attached of all the elements. However, that does not mean that they are not affectionate.
All living things need air, water, and food where they live.
Leucippus
Anaximenes is best known for his doctrine that air is the source of all things. He was the first recorded thinker who provided a theory of change and supported it with observation. He believed the earth was formed by a felting process.
They're all inorganic things.
Clouds, sky, mosquitoes 
That depends on many things. First of all the size of the fence. Also what type of bricks you used and how it is constructed.
No. Only regular polygons can be constructed from the same segment.