World Geography
The import of crude oil and petroleum done from national oil companies of producer countries, which have a net exportable surplus of oil is by

term tenders
monthly tenders
term contracts
All listed here

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World Geography
The term 'flora' in the context of natural vegetation refers to

assemblage of plant species living in association with each other in a given environmental frame
role played by species of animals in the maintenance of ecological balance
a large tract covered by trees and shrubs and its administration for assessing economic benefits
plants of a particular region or period, listed by species and considered as a group

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