The term for a systematic investigation of a phenomenon is "scientific research." This process involves forming hypotheses, conducting experiments, and analyzing data to gain a deeper understanding of specific questions or problems. Scientific research is essential for advancing knowledge in various fields, including medicine, environmental science, and technology. It follows a structured methodology that emphasizes objectivity, reproducibility, and critical thinking. Findings from scientific research can lead to new discoveries, innovations, and solutions to real-world issues, playing a crucial role in shaping our understanding of the natural world and improving human life.