What process do scientists use to answer questions about the world for example Reids experiment with rotting meat?

Scientists use the scientific method, which involves making observations, forming a hypothesis, conducting experiments to test the hypothesis, analyzing the data, and drawing conclusions. In the case of Redi's experiment with rotting meat, Redi observed that maggots appeared on meat left out in the open, so he hypothesized that flies were responsible. He designed an experiment to test his hypothesis by covering the meat with a mesh to prevent flies from landing on it, which led to the conclusion that flies were indeed the source of the maggots.