wood stone gold silver etc
People used different materials during different time eras. In the medieval times, people used cotton, silk and burlap as a clothing source.
wood iron copper bronze steel leather stone
All things came from the natural environment, so they used the plants, flowers, trees, and other things to make things.
opium
yes
cyber alien technology, and peanut butter
The exact number of people it takes to make a medieval catapult. :-)
They asked the Stonemasons to do it
The purpose of technology is to make people's lives easier.
By Technology developing and also people researching how to make bridges and thinking of new ways to make bridges and new materials to use.
Chlorine is used in technology because you can use it when you make cleaning materials and it also can help you to clean your pools. It may or may not be used in technology but it is used in every day life.
If technology you mean "materials"that was used for the bridge, then I found a good answer on Yahoo! answers, just type in this: "What materials were used to make the golden gate bridge?" The question is answered by Horatio, and he had a pretty good answer.