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.
The league failed in Manchuria and Abyssinia. It was  weak-the League's 'powers' were little more than going  'tut-tut'. Sanctions did not work. It had no army. always  A â¦ merica-the strongest nation in the world never  joined.he League of Nations failed because it did not have total membership, withdrawal was easy, it's Security Council was a law unto itself, it did not have a standing army... It â¦ was replaced with the United Nations.