Biology investigates structure and function in the living world and considers how those structures and functions are adapted to specific environments. It studies life at all levels of organization, from the molecular to the total ecosystem. The questions biology addresses bear directly upon many of the problems that confront human society, as well as other organisms and environments that make up the biosphere. A biological perspective provides gratifying insight about the position, role, and uniqueness of humans as organisms within the interactive living world. There is an undeniable beauty and elegance in the living world; biology studies the mechanisms and principles upon which that beauty is elaborated.