A manipulative field experiment was conducted to test the hypothesis that nitrogen pollution affects biodiversity.In this study,a field was treated for 4 years by adding nitrogen to it regularly.A potential limitation to this study is:
A) It was conducted on only one soil type
B) It was run for too long so you cannot trust the results
C) Confounding variables were not held constant
D) Biodiversity is not a reliable indicator for this research question

Question

Quizplus · Accepted Answer

Conducting the experiment on only one soil type limits the generalizability of the findings, as different soil types may respond differently to nitrogen pollution.

A Manipulative Field Experiment Was Conducted to Test the Hypothesis