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Molecular Biology focuses on understanding the interactions and processes between biological macromolecules, such as DNA, RNA, proteins, and lipids, within cells and organisms. It explores how these molecules contribute to the structure, function, reproduction, and evolution of life. By integrating principles from genetics, biochemistry, and cell biology, molecular biology provides insights into complex biological phenomena at the molecular level. In this hierarchy, Molecular Biology, as a subdiscipline under Evolution, emphasizes the molecular mechanisms underlying genetic variation, adaptation, and speciation, thus bridging the gap between population genetics and cellular processes.