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Lead - The branch of biology that studies the animal kingdom. The study of animals has largely moved on to deal with form and function, adaptations, relationships between groups, behavior and ecology. Zoology has increasingly been subdivided into disciplines such as classification, physiology, biochemistry and evolution. With the discovery of the structure of DNA by Francis Crick and James Watson in 1953, the realm of molecular biology opened up, leading to advances in cell biology, developmental biology and molecular genetics. edit
