How did Alexander Fleming contribute to Science?

Discovered penicillin  

Explanation:

Alexander Fleming accidentally discovered penicillin in 1928. He left dirty petri dishes in his laboratory. When he did clean them, he discovered a mold growth, and around this mold, no bacteria were present. There were bacteria in other regions, but none around the growth. He then knew that he discovered an antibiotic: penicillin.

He received the Nobel Prize in Physiology or Medicine in 1945 for his findings. Today, penicillin is used to fight bacterial infections such as pneumonia.

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.

the answer to you question is   jet streams