The study of living organisms is called biology. This branch of science delves into the vast array of life forms on Earth, including their structure, function, growth, evolution, and interactions with their environments. Biologists explore different life forms, from microscopic bacteria to larger animals and plants, examining the complex systems and processes that sustain life. Subfields within biology include ecology, genetics, microbiology, botany, and zoology, each focusing on specific aspects of living organisms. Understanding biology is crucial for advancements in medicine, environmental conservation, and agriculture, as it provides insights that help address both health and ecological challenges.