Final answer:
The particle with the quark composition uud is the proton.
Step-by-step explanation:
The particle with the quark composition uud is the proton. The proton is one of the fundamental particles in the category of baryons. Baryons are composed of three quarks, and in the case of the proton, the quark composition is uud, which stands for an up quark, an up quark, and a down quark.