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What branch of science covers the study of organisms that inhabit Earth?

  1. Physics

  2. Chemistry

  3. Biology

  4. Astronomy

The correct answer is: Biology

Biology is the branch of science that covers the study of living organisms on Earth. Physics (Option A) deals with the behavior and properties of matter and energy. Chemistry (Option B) focuses on the composition, structure, and properties of substances and the changes they undergo. Astronomy (Option D) is the study of celestial objects and phenomena beyond Earth's atmosphere. While all of these sciences may have overlapping concepts and principles, only biology specifically encompasses the study of living organisms on our planet. Therefore, the correct answer is C.