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natural ecosystem(nature, ecology, ecosystem)
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APASmart Define. (1970). pollution-free thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/pollution-free/thesaurus/related
ChicagoSmart Define. 1970. "pollution-free thesaurus" https://smartdefine.org/pollution-free/thesaurus/related (accessed September 30, 2026).
HarvardSmart Define 1970, pollution-free thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/pollution-free/thesaurus/related>.
MLASmart Define. "pollution-free thesaurus" 1 January 1970. Web. 30 September 2026. <https://smartdefine.org/pollution-free/thesaurus/related>