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Developmental biology focuses on understanding how organisms grow and develop from single cells into complex structures, including all aspects of cell differentiation, morphogenesis, and the genetic regulation of these processes. It explores the developmental mechanisms that underlie the construction of biological form, from embryos to adults, and across diverse taxa. In this hierarchy, it is situated within astronomy, emphasizing the interdisciplinary nature of modern science, where insights from astronomy can shed light on the origins, evolution, and distribution of life in the universe, while developmental biology provides crucial context for understanding the complexity and diversity of living organisms on Earth.