What has caused soil, water, and air pollution in eastern europe? eutrophication increased consumption non-native species overfishing

The answer is eutrophication

Explanation:

Eutrophication is the process of pollution of bodies of water, such as rivers and lakes, which end up getting blurred with low levels of dissolved oxygen in the water. This causes the death of various animal and plant species, and has a very high impact on aquatic ecosystems.

These problems can directly or indirectly influence problems in the soil and air in the region.

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.