1. The problem statement, all variables and given/known data Give 2 reasons which give support for the quark substructure of protons and neutrons 2. Relevant equations 3. The attempt at a solution My first reason was due to the fact that in deep elastic scattering of the electron from a proton, the analysis of the structure function (fourier transform) showed the charge distribution of the proton was not a dirac delta functon, and hence the proton has structure, further analysis found quarks were in fact point like and therefore fundamental. I cannot think of another reason which is valid. I thought maybe something about how when you collide things at high energies quark antiquark pairs are created? but I don't think that right. Any help would be fab thank you!