account for [phrasal verb]
(to form a particular part of something): Teenagers account for the vast majority of our customers.
(to explain the cause of something): How do you account for the sudden disappearance of the files?
(to be the cause of something): HIV accounted for over 20,000 deaths within two years.
(to know the location of something): We have accounted for every item that was missing.
(to have a record of how money has been spent): Your job as a treasurer is to account for every penny that we earn or spend.
(to think about something before): The authorities failed to account for the fact that the population is growing.