Answer:
It turned out, he had stumbled unto his life's calling. In Life and Leadership, is a collection of lessons learned and anecdotes drawn from his childhood in the Bronx, his military training and career, and his work under four presidential administrations. The memoir also includes Powell's candid reflections on the most controversial time in his career: the lead-up to the war in Iraq in 2003.
By using Pathos and Logo.
All narratives 
, but they may use different elements to do so.
The correct answer to this open question is the following.
Alexander Fleming ( 1881-1955) was a Scottish scientist who specialized in the field of bacteriology. He spent his life in the laboratory, studying infections in the human's saliva and tears. His major discovery was Penicillin, in 1928, and at that moment he became part of human history.
Due to that great discovery, Alexander Fleming revolutionized the pharmaceutical industry and the use of antibiotics saved millions of lives around the world. That is why, in 1945, he was awarded the Nobel Prize for Medicine. He shared this prize with pathologist Howard Florey and biochemist Boris Chain.
Through his research, Alexander Fleming discovered the way to prevent bacterial growth using penicillin, a strong antibiotic.
