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Biology is the study of living organisms, physics is the study of matter, chemistry is the  study of composition or change in matter. For scientists, it makes things  easier for them. They learn more about biological system on atomic level when it comes to physics. And in chemistry, such things like oxygen, nitrogen,and hydrogen are part of ourv living. Since biology is the study of living things, then chemistry and physics are related to biology since our needs are part of physics and chemistry