Nitrates and phosphates are nutrients that plants need to grow. In small amounts they are beneficial to many ecosystems. In excessive amounts, however, nutrients cause a type of pollution called eutrophication.Eutrophication stimulates an explosive growth of algae (algal blooms) that depletes the water of oxygen when the the algae die and are eaten by bacteria.itrates and phosphates are nutrients that plants need to grow. In small amounts they are beneficial to many ecosystems. In excessive amounts, however, nutrients cause a type of pollution called eutrophication.
Traditional economy. A traditional economy is any historical subsistence economy or one that otherwise falls outside the definitions of market or planned economies. A PURE traditional economy has NO changes in how it is done. Examples of traditional economies include those of the Inuit or those of the tea plantations in south India. Traditional economies are popularly conceived of as primitive or undeveloped economic systems, having tools or techniques seen as outdated.
A mixed economy is an economic system that has some combination of traditional, command, and market economies; or is a modified free enterprise economy. Mixed economies exist because the world is NOT neat and orderly. Often mixed economies form when one type of economy comes into contact with other cultures and they borrow ideas. Major events such as revolutions and economic depressions may cause economic systems to change, and sometimes a mixed economy is the result of an economy simply changing over time.