Why is E correct?

@Shiyi-Zhang, Great question. (E) says, "Toward the end of the ice age, warmth-adapted open-ground beetles colonized the new terrain opened to them faster than soil changes and seed dispersion established new spruce forests." The stimulus of the passage makes the implication that the warmth-adapted open-ground beetles were around before spruce forests were. This makes it quite likely that the beetles colonized the new terrain more quickly than the seed dispersion and soil changes established by spruce forests. Thus, (E) is the correct answer choice. Does this make sense? Let us know if you have any other questions!

Hello - can you explain why (C) is incorrect? My issue with (E) is that the warmth-adapted beetles could have colonized "sooner" than the spruce forests, but "faster" than spruce forests did not seem supported by the passage. Meaning, they could have colonized at the same speed rate, just sooner.