Hordes of rats flee a city when their numbers exceed the carrying capacity
best describes migration caused by overcrowding.
Migration involves the movement of organisms from one place to another
mostly in order to have a better living. When organisms are too
concentrated in a place, it is referred to as overcrowding which results to
more competition for available resources.
In this scenario, rats fleeing a city for better living as a result of number
exceeding the carrying capacity is the most appropriate choice.
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