Heyo, first off the dependent variable is the variable you measure at the end of the experiment, so basically the outcome of the experiment.
Sara and Juan used the four different types of soils which was considered as the independent variable. The independent variable is the variable you change at the beginning of the experiment.
The dependent variable of the experiment which was measured last was seed germination, and plant growth.
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D. Production of oxygen bubbles will increase as distance of plants from the light source decrease
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Cytokinesis is when the cytoplasm divides to form two daughter cells