Sentence:  The parts are <WSD>comprised</WSD> by the whole./ However, the passive voice of "comprise" must be employed carefully to make sense. Phrases such as "animals and cages are comprised by zoos" or "pitchers, catchers, and fielders are comprised by baseball teams" highlight the difficulty. 
Meaning of the word marked with <WSD> tags:  To be made up of; to consist of (especially a comprehensive list of parts). (from earlier 15thc.)