"It" is used to describe something undefined.
In science, you may never use "it" in an experiment because when another scientists is reading the results, they will not know what is being talked about.
Window shutters were thought to be invented in ancient Greece. They were originally made of marble and used for ventilation, controlling light, and protection from weather and the outside environment.
the microscope was originally invented so that scientist could get a better look at cells
"The phenakistoscope or magic disc...was originally invented by Dr. Roget, and improved by M. Plateau
It is said that eyeglasses were originally invented to help the aging population with reading. It wasn't until years later that eyeglasses for distance viewing was introduced.
Memory foam was originally made to improve the safety of aircraft cushions for astronauts.
The key was originally invented by Theodore of Samos and was originally used for securit purposes.
The Microwave was used to cook food.
Graphite was originally used for pencils until a mixture of lead and clay was invented in 1795.
they used the radio to tell people news
To transport goods and people.
the mp3 player was originally made to listen and store music
it was used to play games and take it with you
because your mama is stupid
Gauze was invented in Palestine and was traditionally woven from raw silk. It was originally used for clothing, but is now used for medical dressing usually.
It was used for emotional and forensic testing. It was invented in 1921 by Hermann Rorschach.
that time robot was make to do work and for fashion show
the sponge wasn't invented by man but remodelled. originally people used sea sponges. from a kiwi girl of knowledge