Part 1 of Essay
- any group of subatomic particles believed to be among the basic components if matter are believed to be the fundamental constituents of matter, and have no apparent structure. They are the particles that make up protons and neutrons, which make up the nucleus of atoms. Also, particles that interact by means of the str ....

Part 2 of Essay
.... have failed. Mesons contain a quark and an antiquark, up, down, and strange, while baryons contain three quarks distinguished by flavours. Each has a charge that is a fraction of that of an electron. Up and down quarks make up protons and neutrons, and can be observed in ordinary matter. Strange quarks can be observed in omega-minus and other short lived subatomic particles which play on part in ordinary matter(1985 Quarks). The interpretation of quarks as physical entities poses two problems. First, some ....