Ambient and environment, biotope and ecological mission, population, community, system and ecosystem concepts, biosphere and ecosphere meanings, effects of abiotic and biotic factors on organisms, population and features, biomes and biodiversity.

System, natural and manmade systems, ecosystem and components, habitat, ecological mission, functions of ecosystems, element recycling, ecology of population(natality, mortality, life table, age dispersion etc), ecology of community(domains, diversity of species, succession etc.) dispersion of terrestrial ecosystems, biodiversity and its importance.