Gradual change in living communities that follows a disturbance. - Ecological succession, An ecological succession that begins in an area where no biotic community previously existed. - Primary Succession, Type of succession that occurs in area that was only partially destroyed by disturbances. - Secondary succession , The first species to populate an area. - Pioneer species , Something produced in nature more rapidly than it is consumed by humans. - Renewable resource, A resource that cannot be replaced. - Nonrenewable Resource , Development that meets the needs of the present without compromising the ability of future generations to meet their own needs. - Sustainable development , Movemement of soil components, especially topsoil, from one place to another, to usually by wind, flowing waterm or both. This natural process can be greatly accelerated by human activities that remove vegetation from soil. - Soil erosion, The gradual transformation of habitable land into desert. - Desertification, Air pollution by a mixture of smoke and fog. - Smog , A substance that causes pollution. - Pollutant , Rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water. - Acid rain, The amount of biological or living diversity per unit area. It includes the concepts of species diversity and genetic diversity - Biodiversity, Variety of habitats, living communities, and ecological processes in the living world. - Ecosystem diversity , Number of different species in the biosphere - Species diversity , The variety of genes within a given species. - Genetic diversity , When previous adaptations are no longer suitable to a changed environment. - Extinction, A species whose numbers are so small that species is at risk of extinction. - Endangered species , Splitting of ecosystems into species. - Habitat fragmentation, Increasing concentration of a harmful substnace in organisms at higher trophic levels in a food chain or food web. - Biomagnification, Plants and nanimals that have migrated to places where they are not native. - Invasive species , Protecting and preserving natural resources and the environment - Conservation, Inherited characteristic that increases an organism's chance of survival. - Adaptation ,




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