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Animal migration is the relatively long-distance movement of individual animals, usually on a seasonal basis. It is the most common form of migration in ecology. It is found in all major animal groups, including birds , mammals , fish , reptiles , amphibians, insects , and crustaceans .
Communicable diseases of Old World origin resulted in an 80 to 95 percent reduction in the indigenous population of the Americas from the 15th century onwards, and their extinction in the Caribbean. The cultures of both hemispheres were significantly impacted by the migration of people, both free and enslaved, from the Old World to the New.
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.
The latest results have astounded scientists: while wildlife has decreased in many areas of the world due to human development and climate change, this data shows that the migration has not only ...
The economic history of the United States spans the colonial era through the 21st century. The initial settlements depended on agriculture and hunting/trapping, later adding international trade, manufacturing, and finally, services, to the point where agriculture represented less than 2% of GDP .
Alongside the transportation innovations of globalization, the spread of biological technology has allowed the world to enter a new global economy. Because agriculture is such a huge economic sector it is large portion of the economy, and a large portion of that is the production of wheat in the last few centuries. Technically wheat is an ...
A catt of the Bakhtiari people, Chaharmahal and Bakhtiari Province, Iran Global map of pastoralism, its origins and historical development [1]. Pastoralism is a form of animal husbandry where domesticated animals (known as "livestock") are released onto large vegetated outdoor lands for grazing, historically by nomadic people who moved around with their herds. [2]
The economic history of the world encompasses the development of human economic activity throughout time. It has been estimated that throughout prehistory, the world average GDP per capita was about $158 per annum (inflation adjusted for 2013), and did not rise much until the Industrial Revolution .