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.
A new capital was established at Gondar in 1632, and a period of peace and prosperity ensued until the country was split apart by warlords in the 18th century during the Zemene Mesafint. Ethiopia was reunified in 1855 Tewodros II, beginning Ethiopia's modern history. Ethiopia began to go through a slow modernisation process, and defended itself from an Egyptian invasion in 1874.