Asap! 15 points! in an experiment to test the hypothesis that added phosphate will cause marigold to produce more blooms, the experimenter has two groups of pots planted with marigold seeds. one group gets watered with phosphate. both groups get the same amount of water and light. which is the independent variable in this experiment? a) amount of light b) amount of water c) amount of phosphate d) amount of blooms on a plant (p. s. this is not the same question like my last)