Answer:
The net migration rate is the difference between the number of immigrants (people coming into an area) and the number of emigrants (people leaving an area) throughout the year. When the number of immigrants is larger than the number of emigrants, a positive net migration rate occurs.
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The figure is a rhombus.
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Answer:
River capture events cause isolation of populations of freshwater fish. These populations then evolve separately, as their genes mutate in different ways. Without reproductive homogenization, the populations can become quite different, and can even become separate species on longer time scales