Biology, 19.09.2019 17:10 sherlyngaspar1p9t3ly

Aresearcher is interested in the effects of nitrate and phosphate on plant growth and sets up an experiment in which
groups of five plants are given 1, 2, and 3 grams of nitrate and 1, 2, and 3 grams of phosphate in all combinations over
a period of one month. the researcher measures plant height and weight at the end of the experiment. what is missing
in this experimental design?
a) a control
b) an independent variable
c) a dependent variable
d) a constant

Answers: 1

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Aresearcher is interested in the effects of nitrate and phosphate on plant growth and sets up an exp...