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Cellular Biology, as pertaining to Animals and Fossil Animals, explores the intricate functional units within an organism, encompassing the study of cells, their structures, and processes. This field delves into the examination of Animal Anatomy at a microscopic level, elucidating the complex cellular mechanisms that underpin biological functions in both living and extinct species. By understanding these fundamental units, researchers can unravel the mysteries of evolution, development, and disease, thereby advancing our comprehension of life itself.