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100

what is iodine

a nonmetallic element having important medical uses

200

what is bivouac

a temporary camp or shelter 

300

what is lice 

small,wingless parasitic insects that live on warm blooded animals especially in hair and suck the animals blood

400

what Is galvanized 

coated with zinc??

500

what is chlorine 

a gaseous greenish yellow element used as a bleached and disinfectant in water purification

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