I got confused because I made a distinction between the claim that "some paleontologists" vs. the claim "of paleontologists" as different groups. I don't understand stressing the importance of differences between the whole and the some of a set if on the test questions equate them to each other.

how come we didn’t follow group 4 indicator rules for the first sentence. It has “no” so why wouldn’t we pick either idea and negate it to make it the necessary condition?