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Oleoresinous exudations that seem when the trunk of a tree is injured forestall lack of sap and act as a protective seal in opposition to parasites and illness organisms. Few essential oils are involved in plant metabolism, and some investigators preserve that many of those supplies are simply waste products of plant biosynthesis. Younger crops produce more oil than older ones, but old plants are richer in more resinous and darker oils due to the persevering with evaporation of the lighter fractions of the oil. A fresh, eucalyptus-like oil used for hundreds of yea