Louis Pasteur was a famous French scientist. He developed several important inventions in medicine, chemistry and industry. He was (13) ________ that life could come only from life. He understood that life could not just suddenly occur out of nowhere. His research proved that diseases are spread via bacteria and (14) ________. With this knowledge, humans were able to save many lives. His works greatly benefited human life.
Pasteur discovered a way to make milk, wine and foods safe. The process, known as pasteurisation, was named after him. He figured out that by heating these foods and (15) ________, they could be better preserved. The heat kills the germs that spread disease.
This research was also valuable in medicine. Pasteur was able to prove that germs in the body cause illnesses. He also discovered that animals could be resistant to certain diseases (16) ________ to the diseases in a very minute amount. (17) ________. Vaccinations keep humans from contracting certain illnesses such as rabies, smallpox and chickenpox.
Pasteur's contributions to the scientific world make him (18) ________ of all time.

Question 17.