What happens when nutrient levels become too concentrated in rivers, lakes, and oceans?

Eutrophication is what happens when nutrient levels become too concentrated in rivers, lakes, and oceans.

Eutrophication is when the levels of nutrients and minerals in a body of water become too concentrated. It is usually induced by the release of nitrate or phosphate-containing substances into a water body. Eutrophication leads to an excessive growth of plants and algal which degrades water quality and it may also reduce the oxygen content of the water body. Eutrophication can cause loss of species due to reduced dissolved oxygen in the water, loss of habitat (such as destroying the lake bed habitat for invertebrate organisms) and reduced visibility and increased turbidity of water.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.