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Population exchange is the transfer of two populations in opposite directions at about the same time. In theory at least, the exchange is non-forcible, but the reality of the effects of these exchanges has always been unequal, and at least one half of the so-called "exchange" has usually been forced by the stronger or richer participant.
Internal migration in the People's Republic of China is one of the most extensive in the world according to the International Labour Organization. [1] This is because migrants in China are commonly members of a floating population, which refers primarily to migrants in China without local household registration status through the Chinese Hukou system. [2]
Wildebeest migrating in the Serengeti. Migration, in ecology, is the large-scale movement of members of a species to a different environment.Migration is a natural behavior and component of the life cycle of many species of mobile organisms, not limited to animals, though animal migration is the best known type.
A flock of barnacle geese during autumn migration Examples of long-distance bird migration routes. Bird migration is a seasonal movement of birds between breeding and wintering grounds that occurs twice a year.
Monarch butterflies roosting on migration in Texas. Insect migration is the seasonal movement of insects, particularly those by species of dragonflies, beetles, butterflies and moths.
Perlis [note 1] (Kedah Malay (Perlis dialect): Peghelih), is a state of Malaysia in the northwestern coast of Peninsular Malaysia.It is the smallest state in Malaysia by area and population, as well as the northernmost in the country.
Seismic migration is the process by which seismic events are geometrically re-located in either space or time to the location the event occurred in the subsurface rather than the location that it was recorded at the surface, thereby creating a more accurate image of the subsurface.