Use the following information for questions:
Decide if the study is an observational study or an experiment.
-A biologist measured the increasing amounts of phosphorus in Lake Erie and observed a decreasing number of lake trout over a 5-year period.
A) Observational Study
B) Experiment

Question

Use the following information for questions:
 Decide if the study is an observational study or an experiment.
-A biologist measured the increasing amounts of phosphorus in Lake Erie and observed a decreasing number of lake trout over a 5-year period.
A) Observational Study
B) Experiment

Quizplus · Accepted Answer

The Answer is A

Use the Following Information for Questions