285360 Tell me the substance of his speech. CM 2717896 It's dangerous to mix these substances. WestofEden 55101 I would like to know how these substances are absorbed by the body. CM 62964 A spider can produce a silky substance from tiny openings on its underside. CM 538811 There's a chance that tap water may contain harmful substances like chlorine and lead. blay_paul 328645 Carbon monoxide is a poisonous substance formed by the incomplete combustion of carbon compounds. fcbond