2.Which interaction has heavy carriers? Answer (click and hold): Weak (W+, W-, and Z)
3.Which interactions act on the protons in you? Answer (click and hold): All of them
4.Which force carriers cannot be isolated? Why? Answer (click and hold): Gluons, because they carry color charge themselves.
5.Which force carriers have not been observed? Answer (click and hold): Gravitons (Gluons have been observed indirectly.)
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