Liquid tree - A tree in liquid form., Invented - Created or developed something new., Microalgae - Micoscopic organisms that live in water and clean the air., Pollution - Contamination., Urban areas - Areas related to cities., Breathing - That inhales and exhales air., Traditional - Conventional or typical., Purpose - The reason for which something is done or created., Bench - A long seat for two or more people, typically found in parks.,

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