You set up an experiment to measure how different types of soil affect growth of pea plants. You fill three identical pots with soil and put a pea plant in each pot. The variable in the experiment is: 1) the soil 2) the pot 3) the pea plant 4) the water

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the soil
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Math magician,there to help u :)

the water
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Creative and commited

the soil
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1 the soil
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Answer is 1. the soil; because there is a different type of soil in each case, whereas the characteristics of the other inputs are uniform within their respective categories.
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the soil
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The soil
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M.Sc(Econ),

of course here the variable is soil
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The water
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