Answer: In 1858, Pasteur filtered air through a gun-cotton filter and, upon microscopic examination of the cotton, found it full of microorganisms.
I hope this helped!
Answer:
Please, add some info about topics and recommended topics list
Answer:
Prescription drugs marketed with a specific brand name by the company that manufactures it, usually the company which develops and patents it. When patents run out, generic versions of many popular drugs are marketed at lower cost by other companies.
Explanation:
Satisfy their wants and needs