Number 1 I hope it helps :D
Answer:
I really do not know. I am usually pretty good with this but I don't understand if there is supposed to be a question with it.
I believe the answer is: Sheet metal
Self tapping screws are made by creating a gap in the connector within the thread of a crew, which creates a flute and cutting edge just like what we see on tap. This makes self tapping screws able to tap their own hole in a sheet metal while normal screws can't.
Answer:
B. breaches in the poorly-designed levees
Explanation:
In case of not considering hurricane Katrina a natural disaster, a series of human errors would be highlighted, such as the neglect of a fragile embankment constructed to prevent the overflow of a river.
The rest of the options are incorrect because they all describe natural hazards like strong winds, heavy rain and flooding produced by a sudden, powerful storm.
