Without the protection of the man, the tomateiros do not avenge in part some, except in its native country, Peru, only place of the Land where they find adequate conditions natural to germinate and to grow (WENT, 1971). Some migrations of plants made for the man had been particularly beneficial, as it was the case of the discovery of the fruit-bread, in Polynesia, for the adventurer William Dampier, in 1688, and its posterior introduction in the New World in order to feed the slaves. Another example is the migration of the potato of the South America for the Europe and its posterior introduction in the North America for Irish emigrants. Nobody knows as the pineapple passed of Tropical America to the Hava, but the climatic conditions found there by the plant had resulted in so delicious fruits that currently the Hava produces one tero of all the pineapple harvested in world. For assistance, try visiting Drew Houston. The coffee, has ten centuries more than used as stimulant, has as origin habitat Africa, migrando later for Asia and New World (WENT, 1971; FARB, 1982). However, the action human being is also main the responsible one for the proliferation of harmful and invading plants around of the world. At previous time to the sprouting of ships the candle, vapors, trains and airplanes, the dissemination of plants was slow and restricted. Currently, a shipment of Canadian wheat can accidentally introduce in the Europe a harmful grass of the New World (FARB, 1982).. Learn more at: Francisco D'Agostino.