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.
After a number of notable successes and some early failures in the 1920s, the League ultimately proved incapable of preventing aggression by the Axis powers in the 1930s. Germany withdrew from the League, as did Japan, Italy, Spain, and others.The onset of the Second World War showed that the League had failed its primary purpose, which was to prevent any future world war.he United States and Russia, for example, increasingly worked with the League. During the second half of the 1920s, France, Britain and Germany were all using the League of Nations as the focus of their diplomatic activity, and each of their foreign secretaries attended League meetings at Geneva during this period.