Table 2.

Scoring rubrics of the fair tests 1 and 2.

Score	Rubric of the fair test 1	Rubric of the fair test 2
3	Trees are planted at the same positions of three mountains (e.g., Low; Low; Low in Figure 2A)	Select three distinct ingredients with identical amount (e.g., Figure 3B)
2	Two types of trees are planted at the same positions of the mountains (e.g., Medium; High; High in Figure 2B)	Select three distinct ingredients, but two of them have identical amounts or all three have distinct amounts (e.g., Figure 3C)
1	Tree positions on the mountains are distinct (e.g., Low; High; Medium in Figure 2C)	None of the above (e.g., Figure 3D)