Answer:
Scientists, and physicists so far has said that Quarks are the smallest particle in Matter. Quarks are a kind of particle, they combine to create a particle called as hadrons. They are a very tiny particly that makes up both proton and neutron on an Atom. Individual quarks aren't visible because they are inside a subatomic particles as mentioned above, hadrons.
There are 6 flavors of a quark:
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