It might be wise to use 'compose' instead of 'comprise' in an English exam, because some people believe they are not interchangeable. However most English-speakers will not see a difference and to me: "a deck of cards is composed of 52 cards" and "a deck of cards is comprised of 52 cards" both sound perfectly fine. " 'Constitutes' is a verb for all the elements that make something.
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clee62" The earth constitutes seven major continents."