Walla Zaman Ya Selahy Walla Zaman Ya Selahy "Walla Zaman Ya Selahy" () was the national anthem of the United Arab Republic (UAR), a federation of Egypt and Syria, from 1960. Though the UAR broke up in 1961, Egypt retained the official name of the union until 1971, and the official anthem until 1979. Prior to being adopted as the UAR anthem, it was a nationalist song performed by Umm Kulthum during the Suez Crisis in 1956, known in Egypt and the Arab world as the Tripartite Aggression, when Egypt was invaded by the United Kingdom, France, and Israel. Due to its strongly nationalist
Fish aggression fish against enemies. Territorial aggression can take place not only due to the pressure of mating, producing offspring, or intruders, but also from light intensity. The term intensity is used to describe the rate at which light spreads over a surface of a given area some distance from a source. At lower light levels, the risk of losing resources like food and mates give rise to aggressive behavior among the fish belonging to a territory. Additionally, for further understanding on how the rate of aggression and distance among neighboring fish varied with nighttime light intensities in the same area, Sveinn