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Predators may increase the biodiversity of communities by preventing a single species from becoming dominant. Such predators are known as keystone species and may have a profound influence on the balance of organisms in a particular ecosystem. Introduction or removal of this predator, or changes in its population density, can have drastic cascading effects on the equilibrium of many other populations in the ecosystem. For example, grazers of a grassland may prevent a single dominant species from taking over.

When a keystone species is lost another species might become?
Answer: dominant
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Bronx gang life was depicted in the 1974 novel The Wanderers by Bronx native Richard Price and the 1979 movie of the same name. They are set in the heart of the Bronx, showing apartment life and the then-landmark Krums ice cream parlor. In the 1979 film The Warriors, the eponymous gang go to a meeting in Van Cortlandt Park in the Bronx, and have to fight their way out of the borough and get back to Coney Island in Brooklyn. A Bronx Tale (1993) depicts gang activities in the Belmont "Little Italy" section of the Bronx. The 2005 video game adaptation features levels called Pelham, Tremont, and "Gunhill" (a play off the name Gun Hill Road). This theme lends itself to the title of The Bronx Is Burning, an eight-part ESPN TV mini-series (2007) about the New York Yankees' drive to winning baseball's 1977 World Series. The TV series emphasizes the boisterous nature of the team, led by manager Billy Martin, catcher Thurman Munson and outfielder Reggie Jackson, as well as the malaise of the Bronx and New York City in general during that time, such as the blackout, the city's serious financial woes and near bankruptcy, the arson for insurance payments, and the election of Ed Koch as mayor.

When was 'A Bronx Tale' released?
Answer: 1993
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Combined with this influx of classical ideas was the invention of printing which facilitated dissemination of the printed word and democratized learning. These two things would later lead to the Protestant Reformation. Toward the end of the period, an era of discovery began (Age of Discovery). The rise of the Ottoman Empire, culminating in the Fall of Constantinople in 1453, eroded the last remnants of the Byzantine Empire and cut off trading possibilities with the east. Europeans were forced to seek new trading routes, leading to the expedition of Columbus to the Americas in 1492, and Vasco da Gama’s circumnavigation of India and Africa in 1498. Their discoveries strengthened the economy and power of European nations.

In what year did Vasco da Gama sail around India and Africa?
Answer:
1498