The definition of symbiosis has varied among scientists. Some advocated that the term symbiosis should only refer to persistent mutualisms, while others thought it should apply to any type of persistent biological interaction (in other words mutualistic, commensalistic, or parasitic).
The League of Nations failed for a couple of reasons: 1  The United States was not part of it. 2  More importantly, the countries in the League did not take the idea of collective security seriously.3  When countries attacked others, nothing was done. 4  For example, Italy attacked Ethiopia and Japan attacked China. The United States was not part of it. 2  More importantly, the countries in the League did not take the idea of collective security seriously. 3  When countries attacked others, nothing was done. 4  For example, Italy attacked Ethiopia and Japan attacked China. 5  In both cases, nothing serious was done.
Ethiopia is Africa's oldest independent country and its second largest in terms of population. Apart from a five-year occupation by Mussolini's Italy, it has never been colonised.thiopia has suffered periodic droughts and famines that lead to a long civil conflict in the 20th Century and a border war with Eritrea. In the first part of the 20th Century Ethiopia forged strong links with Britain, whose troops helped evict the Italians in 1941 and put Emperor Haile Selassie back on his throne.