Select the text from the paragraph that best helps you understand that exigency means
pressing need. There may be more than one correct choice.
While most scientific findings are the result of deliberate and carefully designed
experiments, occasionally a major discovery happens in a more fortuitous way. One
such example is the discovery of penicillin in 1928 by the Scottish bacteriologist
Alexander Fleming. After working as a field doctor during World War I and
witnessing how many soldiers died needlessly from bacterial infections, Fleming
recognized the exigency of finding a chemical that could fight these afflictions. He
began to conduct experiments by growing bacteria in Petri dishes and treating
them with various chemicals. Unfortunately, none of the chemicals he tested proved
effective at stopping the bacteria's growth.