Explanation for Question 44 From the Reading Section on the 2018 May Sat
Question number 44 asks based on the passage, 2 what can reasonably be inferred about galaxies billions of years ago? 3 So looking at our answer choices, choice ISS, 4 they looked very different from galaxies today. 5 If you remember from the passage, we do have evidence of this answer choice 6 being correct. We see at the 7 end of the second to last paragraph, 8 um, the phrase powerful new data for statistical studies of galaxy growth and evolution. 9 So there's an idea that the galaxy is constantly evolving. 10 Um, and we also see that there's, 11 um, a study of a large number of different samples implying that different 12 samples are different. Um, the, the appearance of these galaxies is different depending 13 on when they reformed. So both of those pieces of evidence lead us to 14 conclude that choice is correct. 15 That galaxies billions of years ago did look very different from galaxies today. 16 Um, the other answer choices are less well supported by the passage choice base 17 says they were dominated by this type I a supernova. 18 This isn't really referenced in the passage. We know that they're studying the type 19 III, but we don't know that galaxies were dominated by these in the past 20 twice. C says they're a group together in one location in the sky. 21 The passage leads us to believe that based on the vast scope 22 of the universe that's being studied, um, 23 there is not, uh, a sort of tight grouping of galaxies together in one 24 spot that would make them easier to study. 25 So C is out and choice DSS they're much larger than expected. 26 Um, again, we know that these galaxies are very, 27 very large, but not necessarily that they're large earlier than astronomers 28 had expected. So D is out as well and a is our correct answer 29 for 44.