Mass extinctions occur for many reasons. Changes in the environment might make it impossible for the local life to survive, diesease or drought might strike, or there might be a natural disaster. These extinctions make good divisions in geologic time because they are easy to locate over a wide area and mark a definitive change in the Earth's systems.
Answer:
B
Explanation:
The whole war was fought for to gain land to the east of the Mississippi in the Ohio Valley.
Africa, Australia, and South America.
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