Why is the development of a research plan necessary before testing a hypothesis?

A research plan is pivotal to a research project because it identifies and helps define your focus, method, and goals while also outlining the research project from start to finish

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.