| http://www.w3.org/ns/prov#value | - -signs such as seizures may last 48 to 72 hours but residues can persist for months to years. what is the definition of pyrethrins, pyrethroids, and pyrethrum? - pyrethrins are from pyrethrum flowers (chrysanthemum) they are natural - pyrethroids are synthetic and divided into type 1 and type 2
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