A researcher is interested in the effects of nitrate and phosphate on plant growth and sets up an experiment in which groups of

Question

2 years ago

13

A researcher 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?
Question 9 options:

a control

an independent variable

a dependent variable

a constant

Biology

1 answer:

uysha [10] · Answer 1 · 2022-09-17T14:21:03+03:00

uysha [10]2 years ago

6 0

Answer:

an independent variable

Explanation: