Clear Comparative Relationships

A passage that sets two things side by side is never really about either thing alone. It is about the relationship between them. The test question will almost never ask you to describe one side in isolation. It asks what they share and where they diverge, so your job while reading is to sort every detail into one of two columns as it goes by: shared traits in one, unshared in the other. Once you have those two columns, most questions answer themselves, because the right answer usually just names what sits in each column accurately, and wrong answers usually swap the columns, blend them, or invent a third trait nobody stated.

This sorting also guards against a specific trap: order of mention. A passage will often describe one thing first and the other second, or lay out one method, then a second as a fallback, and a careless reader assumes the second one is weaker, less favored, or the author's lesser choice. Nothing about sequence implies ranking. The passage about tree-ring dating versus radiocarbon dating makes this explicit: radiocarbon is described second because it is the fallback method, not because it is inferior in every way. It is actually broader in reach. You have to read what the passage says the traits are, not where they land in the sentence order.

This relationship sits next to two others the test builds the same way: sequence, where you track what happened before what, and cause, where you track what produced what. Comparison swaps 'what led to what' for 'what matches and what splits.' When a passage compares three things instead of two, the same chart just grows a third column, and the question usually asks you to find the one trait that splits one item from the other two, or the one trait all three share.