What are the two main sources of nutrient inputs that contribute to eutrophication?a.Industrial waste and sewage dischargeb.Urban runoff and groundwater seepagec.Atmospheric deposition and industrial wasted.Agricultural runoff and sewage discharge

The two main sources of nutrient inputs that contribute to eutrophication are:

a. Industrial waste and sewage discharge b. Urban runoff and groundwater seepage c. Atmospheric deposition and industrial waste d. Agricultural runoff and sewage discharge

The correct answer is d. Agricultural runoff and sewage discharge.

Here's why:

1. Agricultural runoff: This is a significant source of nutrients, particularly nitrogen and phosphorus, which are used in large quantities as fertilizers in agriculture. When it rains, these nutrients can be washed off the land and into rivers, lakes, and oceans.

2. Sewage discharge: Wastewater treatment plants often discharge treated water into rivers and oceans. This water can still contain high levels of nutrients, particularly if the treatment process is not fully effective.

These two sources can lead to an excess of nutrients in water bodies, causing an overgrowth of algae and other plants, a process known as eutrophication. This can have serious impacts on water quality and the health of aquatic ecosystems.