Reasons which give support for quark substructure of p and n

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Poirot
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Homework Statement


Give 2 reasons which give support for the quark substructure of protons and neutrons

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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!
 
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I don't know how to hint without just telling for a question like this but consider the phenomenology of inelastic scattering of nucleons...
also consider how quark model categorizes hadron spectra... that's not perfect as it assumes no better model than quarks without argument that no such better model exists but well it supports quark substructure *as a model* until something better comes along.