1) what is'Eutrophication'? A) Excessive plants growth in water and depletion of oxygen B) Adding plastic wastages into water.
c) Method of water Purifying
D) Increase of fish in water

A: Excessive plants growth in water and depletion of oxygen

Water is not a commercial product like any other but rather a heritage which must be defended and protected, especially in the presence of a global decline in the availability of drinking water and increase in its demand.
Despite the considerable efforts made to improve the water quality by limiting nutrient enrichment, cultural eutrophication and the resulting algal blooms continue to be the main cause of water pollution. The prevention and protection action that countries must adopt to safeguard the quality of surface water as requested not only by the scientific community and other experts, but to an increasing extent also by citizens and environmental organisations, is therefore increasingly important (ec.europa.eu).
Management of the eutrophic process is a complex issue that will require the collective efforts of scientists, policy makers and citizens.