Answer:
A bat using echolocation.
A whale using sonar waves.
A gazelle listening to the footsteps of a cheetah and running away.
Explanation:
My extensive knowledge of the show Wild Kratts.
Eutrophication is a process that leads to enrichment of ponds, lakes and any water body with minerals such as nitrogen and phosphorus. Aquatic ecosystems are diverse and consists of phytoplanktons, zooplanktons, fish and other animals. Too much enrichment of the ecosystem adversely effects the flora and fauna of the aquatic bodies. Eutrophication leads to more uptake of oxygen and increases biological oxygen demand of water. With less oxygen available for animals inside the aquatic systems, they might began to die. Eutrophication is a result of human activities and must be minimized for the betterment of aquatic bodies and aquatic animals. Thus, eutrophication might lead to destroy the aquatic bodies over a period of time.
We can detect the hardness of water taken from different sources by adding soap to it. If the soap does not form micelle in the water then it will be hard water. In simple language if the soap doesnot disslove in water then it will be soft water.