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, decomposers - organism which cause decay and breakdown of dead plants, humus - organic component of soil, abiotic factors - non-living physical components of an ecosystem, plagioclimax - plant succession interupted by human activity, producer - plant organism that makes it's own energy from the sun, consumer - an animal that eats other organisms, secondary consumer - animals that feed on primary consumers, ecosystem - a community of plants and animals in a place, biome - the largest type of ecosystem,

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