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People pls help me for some of question, I will die for it. HOW PLANTS COMBAT DISEASE? WHY AUSTRALIAN NATIVES HAVE OILS IN THIER LEAVES (E.G. EUCALYPTS, WATTYL'S, TEA TREE'S) WHY AUSTRALIAN GUM TREE LEAVES IN THE USA, THERE WOULD BE LITTLE EVIDENCE OF PATHOGENS OR INSECT ATTACK? Thanks...