Where does the pollution from human activities collect?

The pollution from human activities can collect anywhere on the planet.

Explanation:

This is because of movement. When the earths tectonic plates move or simply when you go on your morning jog. The earth is constantly moving and so is everything on it. Water's strong currents can break down plastic and other things left by humans, when the currents was the substance on the shore the wind helps it to move yet again to another place.

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.