 This is thought to add structural resistance to harsh environments in which many Archaea are found.Similarly, natural rubber is composed of linear polyisoprene chains of very high molecular weight and other natural molecules.After release, isoprene is converted by short-lived free radicals (like the hydroxyl radical) and to a lesser extent by ozone into various species, such as aldehydes, hydroperoxides, organic nitrates, and epoxides, which mix into water droplets and help create aerosols and haze.