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Physics is the only real science. physics is the study of matter and energy and how they interact. everything is made up of matter and energy so physics is basically the study of everything. for instance,  when studying any unit was its all built on physical laws and theories. for instance, photosynthesis talks about how plants use the energy of a photon from sunlight to "ionize" an electron and excite it, which then energy from that electron is used to produce ATP.