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An experiment was conducted to determine the effects of fertilizer and bacteria on the growth of clover plants. The experiment consisted of 4 groups. All groups received the following treatments:

  • 1 pint of sand
  • 5 clover seeds
  • Equal amounts of water and sunlight

Each group then received various other treatments listed below:

  • Group A: 1 pint of fertilized soil
  • Group B: 1 pint of fertilized soil, rhizobium bacteria
  • Group C: 1 pint of unfertilized soil
  • Group D: 1 pint of unfertilized soil, rhizobium bacteria

The following data were collected (height of plants measured in centimeters):

Time after planting Group A Group B Group C Group D
1 week 0.9 1.8 0.0 1.0
2 weeks 1.2 2.9 0.2 1.4
3 weeks 1.3 3.7 0.4 1.8
4 weeks 1.5 4.2 0.7 2.1

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What conclusion BEST aligns with the data from the experiment?


Their differences in clover height can be attributed to the bacteria in the soil preventing pathogenic bacteria from harming the plant.


The presence of bacteria had no effect on the height of the clovers.


The presence of fertilizer had no effect on the height of the clovers.


The plants with fertilizer and bacteria experience the most growth due to their ability to find and fix nitrogen.


The clover heights of plants with fertilizer were tallest with bacteria having no effect. This can be attributed to the excess nitrogen available to the plants.

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