M= 1.3
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Answer:
It divides the Atlantic Ocean.
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There are many events that would likely to happen when the El Niño year kicks in. During the period, there trade winds in the Central Pacific and Western Pacific is weaken. The temperature of the surface water in South America increases making it warm. Most of all, the weather in all over the planet changes.
I believe the correct answer would be behavioral isolation. It is an isolating mechanism where two populations or species cannot mate because of the differences in their courtship and mating behavior. It is also called as ethological isolation.