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Question 1
A research team is studying the effects of three different fertilizers (X, Y, and Z) on the growth of a specific plant species. They have four experimental plots with different fertilizer combinations:
  • Plot 1: Fertilizer X only
  • Plot 2: Fertilizer Y only
  • Plot 3: Fertilizer X and Fertilizer Z only
  • Plot 4: Fertilizer Y and Fertilizer Z only
After a period of observation, they note the following:
  • Plants in plots with Fertilizer X showed significantly increased height compared to a control group (no fertilizer).
  • Plants in plots with Fertilizer Y showed a slightly increased leaf area compared to the control group.
  • Plants in Plot 3 (X and Z) showed no significant difference in height compared to the control group.
  • Plants in Plot 4 (Y and Z) showed significantly increased height compared to the control group.
Based on these observations, which of the following conclusions is best supported?
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