| http://www.w3.org/ns/prov#value | - ic activity in the poplars.The uptake of oVOCs, the scientists concluded, appeared to be part of a larger metabolic cycle.Plants can produce chemicals to protect themselves from irritants and repel invaders such as insects, much as a human body may increase its production of white blood cells in reaction to an infection.But these chemicals, if produced in enough quantity, can become toxic to the p
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