Question

Which of the following is a consequence of water polluted by human sewage?

a. pathogens
b. disease vectors
c. high levels of contaminants
d. all of the above

Answer 1

D. all of the above. I'm pretty sure

Answer 2

Answer;

-All of the above

-pathogens, disease vectors, and high levels of contaminants

Step-by-step explanation;

Water pollution is a large set of adverse effects upon water bodies (lakes, rivers, oceans, groundwater) caused by human activities. Water pollution is caused by;

• Increases in nutrient loading may lead to eutrophication.
• Organic wastes such as sewage and farm waste impose high oxygen demands on the receiving water leading to oxygen depletion with potentially severe impacts on the whole eco-system.
• Industries discharge a variety of pollutants in their wastewater including heavy metals, organic toxins, oils, nutrients, and solids.
• Discharges can also have thermal effects, especially those from power stations, and these too reduce the available oxygen.