O2 (cont.) it is suitable for this role because: it is readily available (occurs almost everywhere on the earth) it diffuses easily across cell membranes it is highly reactive and thus readily accepts electrons the use of O,by aerobic organisms is linked to the production of highly destructive ROS (reactive oxygen species)such as:hydrogen peroxide, superoxide radical,hydroxy radical,and singlet oxygen - it is suitable for this role because: * it is readily available (occurs almost everywhere on the earth) * it diffuses easily across cell membranes * it is highly reactive and thus readily accepts electrons - the use of O2 by aerobic organisms is linked to the production of highly destructive ROS (reactive oxygen species) such as: hydrogen peroxide, superoxide radical, hydroxy radical, and singlet oxygen O2 (cont.)