The main policy changed between presidents but a lot of it was containment of the spread of communism and some intervention against soviet backed coups such as Vietnam and places in Africa such as the Congo and the third was supporting EE countries and leave them open for influence by western powers and democratic powers
If there was a sudden, significant event in the area (such as a volcanic eruption) then a population with higher biodiversity is more likely to contain at least 1 species which will be adapted enough to survive in the changed environment than an area with lower species diversity.<span />
Answer:
It was due to the weaknesses of the Weimar Government.
