because
be·cause
 /bıˈkɑːz, bıˈkʌz/  conj  
  : for the reason that
   I ran because I was afraid.
   We were late because our car wouldn't start. = Because our car wouldn't start, we were late.
   “Why did you do it?” “Because she told me to.”
  because of
   : for the reason of
    The picnic has been canceled because of [=due to, on account of] bad weather.
    Because of this [=for this reason], only very rich people can afford to live on the island.
    Because of you, we missed the bus. [=you caused us to miss the bus]
    The accident happened because of [=through] carelessness.
  just because
   : for the simple or single reason that
    Don't get nervous just because the teacher might ask you a question.
    We can't assume it will rain today just because it rained yesterday.
    Just because your friends do it, that doesn't mean that you should do it, too.