How could shifts in the physical environment have caused major changes in early civilizations? select all that apply. a. too much or too little rain may have ruined crops, creating food shortages. a. earthquakes or erupting volcanoes may have destroyed communities. a. buildup of silt could have made rivers less salty, increasing the supply of clean water. a. long-term farming could have improved the quality of the soil, increasing crop yields.

alliances in ww1 were different from ww2 because the entente in ww1 made up of serbia,russia,france,britan,japan and italy later america  and all allied in a sort of balance of power and too keep germany,austria-hungary,and the ottomans down. russia allied the serbians in order to exert its influence in the balkans while france allied the russians because france was still in dismay and insulted after the defeat to the germans during the unification of germany and britian allied the belgians after the germans invasion of belgium.in ww2 the alliances were in a preemptive attempt to deter any further wars into happening while germany and italy allied since they were insulted and humiliated after the previous war while also sharing a similar ideology of facsim along with japan which all 3 had a want for world domination and agreed to assist one another in the endevours 

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