When you think about it, the flow sewage is a form of pollution. Therefore the raw sewage would pollute their source of survival being the river which they drink, and bath from.
The answer is, Silk, Rice, and indigo! Hope this helps!
The appropriate response is a Semantic Memory. It alludes to a segment of long haul memory that procedures thoughts and ideas that are not drawn from individual experience. Semantic memory incorporates things that are regular information, for example, the names of hues, the hints of letters, the capitals of nations and other fundamental realities gained over a lifetime.
