Question

A scientist wants to know how the distance from a nearby lake affects the amount of nitrogen found in the soil. She collects soil samples at various distances from the lake and measures the amount of nitrogen in the sample What is the manipulated variable in this experiment?

A. The distance from the lake
B. The size of the lake
C. The total number of samples
D. The amount of nitrogen in each sample

Answer 1

a, because if ur question is how the distance affects nitrogen in soul you would have to manipulate the distance several times to figure out different distances do

Answer 2

Answer: I would think A (The distance from the lake) but if I'm wrong please let me know and ill fix it ASAP!

Explanation: A manipulated variable is an independent variable subject to the changes of an experiment to analyze its effect on a dependent variable.