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Book 5: Chapter 19 – Different Sciences
  1. Zoology is the branch of biology that relates to the animal kingdom. The history of zoology traces the study of the animal kingdom from ancient to modern times.
  2. Ecology is the scientific study of the relations that living organisms. The word "ecology" was coined in 1866 by the German scientist Ernst Haeckel.
  3. Biology is a natural science concerned with the study of life and living organisms. It is a vast subject containing many subdivisions, topics and disciplines.
  4. Botany is a branch of biology that involves the scientific study of plant life. Today botanists study over 550,000 species of living organisms.
  5. Entomology is the scientific study of insects. At some 1.3 million described species, insects account for more than two-thirds of all known organisms.
  6. Chemistry is the science of matter, especially its chemical reactions. Chemistry is sometimes called "the central science" because it connects physics with other natural sciences such as geology and biology.
  7. Ornithology is a branch of zoology that concerns the study of birds. A wide range of tools and techniques are used in ornithology and innovations are constantly made.
  8. Optics is the branch of physics which involves the behavior and properties of light. Optics began with the development of lenses by the ancient Egyptians and Mesopotamians
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