| Answer | Crossword Clue |
|---|---|
| PROTON | Particle composed of three quarks |
| PROTON | It's composed of three quarks |
| BARYON | Subatomic particle made of three quarks |
| PROTONS | Particles composed of two up quarks and one down quark |
| GLUON | Subatomic particle thought to bind quarks together |
| GLUON | Massless subatomic particle believed to bind quarks together |
