Biology

Boyle

14 June, 01:31

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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