Final answer:
The UN has responded to the crisis in Darfur by providing humanitarian aid, deploying peacekeepers, and calling for a ceasefire.
Step-by-step explanation:
The UN has responded to the crisis in Darfur in a number of ways. First, they have provided humanitarian aid to meet the immediate needs of the affected population. Second, they have deployed peacekeepers to help maintain security and protect civilians. And third, they have called for a ceasefire to bring an end to the violence and promote a peaceful resolution.