Question

Why does oxygen concentration decrease when household drainage water discharge in​

Answer 1

Explanation:

Scale help in calculating the area on the map. This is because it helps the map reader to measure various dimensions in the map such as width and length. The scale is used in map enlargement and reduction. Scale help to determine the amount of content/feature that a map will contain.

Answer 2

Answer:

In a water body, as the organic wastes or domestic sewage are introduced, microbes involved in its degradation start consuming a lot of oxygen resulting in a decline in the amount of dissolved oxygen in the water body.