Extinct, Oxygen in the form of molecules with three atoms, created by exposure of oxygen to electrical discharge or ultraviolet radiation, having a sharp smell., Pollution, The natural environment of a plant or animal., Ozone, Contaminating material that pollutes., Endangered species, The continuous modification and adaptation of organisms to their environments through selection and hybridization., Poacher, A species of plant or animal that is in danger of becoming extinct., Conservation, A haze caused by the effect of sunlight on foggy air that has been polluted by vehicle exhaust gases and industrial smoke., Evolution, The mass of gases surrounding the earth or any other celestial body, Smog, A substance used to kill insects., Habitat, One who illegally hunts on another's property., Atmosphere, No longer existing, as an animal species., Insecticide, The warming trend on the surface and in the lower atmosphere of a planet, held by scientists to occur when solar radiation is trapped, as by emissions from the planet., Biosphere, The part of the earth and its atmosphere in which living organisms can exist., Greenhouse effect, The act of preserving and protecting from loss, destruction, or waste..

Environment

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