Question

the purpose of the ecocolumn is to demonstrate that whatever is added to the land, eventually impacts which of these? the plastic bottle the lower water layer the color of the bottle the light source

Explanation:

An ecocolumn models an ecosystem, showing how land additions (like pollutants) move through the system. The plastic bottle is a container, bottle color is irrelevant, and light source is external. The lower water layer is part of the aquatic ecosystem in the ecocolumn, so land additions (e.g., chemicals, pollutants) eventually affect the water layer via processes like leaching or runoff.

Answer:

the lower water layer