1) material used for construction such as clay, rocks, sand, wood a) Building material b) Fumes c) Architecture 2) the use of less energy to perform the same task or produce the same result. a) Contractor b) Automation c) Energy efficient 3) an amount of gas or vapor that smells strongly or is dangerous to inhale. a) Energy efficient b) Fumes c) Contractor 4) a person who is concerned about protecting the environment a) Organic b) Environmentalist c) Smart 5) : relating to or derived from living matter. a) Architecture b) Smart c) Organic

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