The branch of science that studies living organisms is called biology. Biology encompasses various sub-disciplines, such as microbiology, ecology, zoology, and botany, focusing on the diversity, behavior, structure, and functions of life forms. Biologists study everything from single-celled organisms to complex ecosystems, exploring how organisms interact with each other and their environments. The knowledge gained from biological research is essential for understanding health, biodiversity, conservation, and the impacts of human activities on the planet. Biological principles are fundamental to fields like medicine, environmental science, and agriculture, making biology a critical area of study.