Symbiosis describes close interactions between two or more different species. There are four main types of symbiotic relationships: mutualism, commensalism, parasitism and competition. Symbiotic relationships are important because they are a major driving force of evolution.
Border Security. Exporters. Definition. For C-TPAT purposes, an exporter is defined as: A person or company who, as the principal party in interest in the export transaction, has the power and responsibility for determining and controlling the sending of the items out of the United States.
What's on This Page. Importing and Exporting. Imports are any resource, good, or service that producers in one country sell to buyers in another country. Exports are any resource, intermediate good, or final good or service that a buyer in one country purchases from a seller in another country. 1  Export.gov. 2  Animal and Animal Product Export Information.  Exporting a Motor Vehicle.