Where is freeze-thaw most active?

2/6 of be by to 2/6 is to 24/72 ?

Does anyone know the answers for these

Which revelation resulted from the observation of the spectrum of different galaxies? a. there were more galaxies whose spectrum was blueshifted b. there were no galaxies whose spectrum was redshifted c. there were more galaxies whose spectrum was redshifted d. there were no galaxies whose spectrum was blueshifted