pioneer - plant species which cangrow without soil, only needing sunlight for photosynthesis, sere - stage in vegetation succession, trophic level - energy level in a food chain, primary producer - vegetarian herbivore, Decomposers - organism which cause decay and breakdown of dead plants, humus - organic component of soil, abiotic factors - physical components of an ecosystem, plagioclimax - plant succession interupted by human activity,

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