The Natural Science passage is the most linear of all the passages. There isn't as much grey area, as the topic itself, no matter what it is, is usually quite straightforward and easy to understand. The questions will cover the basic subject, as well as some details. There are 5 questions on this part that you can answer without reading the passage first. Because the science section usually has some numbers, names and/or dates, the speed at which you can go on this passage is pretty fast.