The branch of science that studies living organisms is biology. Biology encompasses a wide range of sub-disciplines, including molecular biology, cellular biology, ecology, genetics, and zoology, among others. It seeks to understand the structure, function, growth, reproduction, and evolution of living organisms and their interactions with one another and their environments. Biological research plays a crucial role in addressing significant challenges such as health issues, environmental conservation, and food security. Through the study of biology, scientists can gain insights into the living world, enhancing our understanding of life and informing practices in medicine, agriculture, and conservation.