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25 August, 10:17

A chemist is studying the effects of minerals on plant growth. she knows that phosphorus stimulates plant growth. She decides to test the effects of various phosphorus concentrations on plants every 5 days over a 20 day period. What is the independent variable in this experiment

a. amount of plant growth

b. phosphorus concentration

c. time of experiment

d. types of plants

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  1. 25 August, 10:23
    0
    I think its b because its the one that the chemist is changing
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