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What is the study of the nature and functioning of living organisms?

  1. Astronomy

  2. Physics

  3. Chemistry

  4. Biology

The correct answer is: Biology

Biology is the study of living organisms and their interactions with other organisms and the environment. This includes the structure, function, growth, origin, evolution, and distribution of living things. Astronomy (option A), Physics (option B), and Chemistry (option C) deal with the study of non-living matter and energy and are not directly related to the nature and functioning of living organisms. Therefore, they are incorrect options.