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.
The answer to the question is : B: 6;6
<span>There are __6__ different types of air masses that coming from _6___ different locations that influence the weather in North America., namely :
a) </span>Continental Polar ; Large sub polar land area b) Continental Arctic ; Canada, United States c) Continental Antarctic ; Antartica d) Continental Tropical ; Sahara, Arabian & Australian Deserts e) Maritime Polar ; Polar Oceans f) <span>Maritime Tropical ; Rocky Mountains</span>
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I think it would be false
