Use the following information to answer the next two questions Characteristics of quarks and antiquarks Quarks Antiquarks Flavour Spin Baryon Baryon Symbol Charge Symbol Charge Spin number number Up U 3 u generation Down + - 2 De Strange coke costs generation Charm +3 3 0 Bottom - 3 + + 3 generation Top 21. A meson is particle that normally has a very short lifespan and is always made of a quark and an antiquark pair. The meson that is made of an up and an antidown quark would be a(n) A. It meson B. At meson C. n meson D. electron-antineutrino 22. Using the chart above, it can be determined that an antiproton will have the quark composition A. uud B. uds C. dds D. udd 23. According to the standard model, a p decay involves a transformation of quarks in which A. an up quark changes into a down quark B. a down quark changes into an antiup quark C. a down quark changes into an up quark D. an up quark changes into an antidown quark