One challenge faced by the european union is the

Europe is currently facing a refugee crisis. Thousands of people flee because it is the only alternative. In a moment of war, very close to European borders, the outflow of refugees is concentrated on the continent.

The Syrian and Iraqi conflicts are getting more and more settled. There is lack of drinking water, the destruction of infrastructures, lack of medical services and the pain of war in the region of the Middle East.  

In the case of Africa, the situation is different. Tens of thousands of people try to reach Europe each year, often dying while crossing the Mediterranean or the Sahara desert. They do it because they believe that a better job opportunity awaits them there.

unbeknownst to the slave-ship captains, the daily dancing and exercise regime and vernacular dance are also derived from america's african-based slave legacy. both are african-american cuisines from the slavery era.

explanation:

food chain i would say only because there is competition on getting food and survival