Select the correct answer from each drop-down menu. Complete the paragraph with the correct transitional words. Before the Big Bang, there was no matter in the universe. It was a dense, hot, soupy mixture. Scientists call this stuff quark-gluon plasma, or quark soup in layman’s terms. , this plasma cooled and gave rise to the first atoms, mostly helium and hydrogen. , the first stars and galaxies formed. , scientists still do not have conclusive evidence of how the first stars and galaxies in the universe came into being.