Compare and contrast the response to Hurricane Katrina (2005) versus the response to the World Trade Center on 9/11 (2001)

Compare and contrast the response to Hurricane Katrina (2005) versus the response to the World Trade Center on 9/11 (2001), comparing the two incidents with consideration for the questions listed below:
-How was critical infrastructure affected?
-Who were the first responders on the scene and what additional personnel/agencies were called to assist?
-What was the command structure utilized during the response?
-Was the area/nation prepared for this critical incident?