What happened to the quarks that existed freely during the particle era?
A) They combined in groups to make protons, neutrons, and their antiparticles.
B) They froze out of the soup of particles at the end of the era.
C) They evaporated.
D) They combined in groups to make electrons and neutrinos.
E) They combined in groups to make W and Z bosons.
Question 2
Before about 50,000 years after the Big Bang the universe was
A) radiation dominated.
B) quark dominated.
C) lepton dominated.
D) matter dominated.
E) dark energy dominated.
combined-cycle power plant
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