A plant from which climate type was NOT studied in Experiment 1?
A. Prairie
B. Tropical forest
C. Northern forest
D. All climate types were studied in Experiment 1.

Experiment 1
For 6 weeks, several specimens of three different types of plants, selected from among four different types of plants, were grown in a greenhouse. The average growth of each type of plant was recorded every two weeks. The soil used for the plants was treated to remove any trace of fungi to establish expected growth without the plant-fungi association. The results are shown in Table 1.

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Plant type 1 3 4 Table 1 Average plant growth (in) Week 2 Week 4 Week 6 3.7 1.2 0.6 0.9 2.8 1.7 2.6 2.0 3.5