The two sub-questions discussed here are both relatively high demand. They are the last two questions in a sequence of five covering both the water and carbon cycles, arranged as shown in Table 1. In the Paper 1 exam, the sequence could be reversed with the 3–8 mark questions testing the carbon cycle and the 12 and 20 mark questions testing the water cycle.
There are several important points to remember when tackling a full question sequence such as this:
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