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.
6 The Leagueâs Failures in the 1930s In the 1920s, the League of Nations had been quite successful. In the 1930s, it failed terribly. This spread looks at the Leagueâs two main failures in the 1930s â in Manchuria and Abyssinia. By 1935, most countries did not think that the League could keep the peace.he main aim of the League of Nations was to stop wars. In the 1920s, there were many small disputes between countries, which the League tried to solve. This spread looks at just two disputes (you will need to research other incidents).