Only once ventilation has been achieved is the firefighters attempt to enter a structure when backdraft conditions are present.
<h3>What is the meant by ventilation?</h3>
In the workplace, ventilation is used to reduce exposure to airborne contaminants. It is widely employed to purge the air of contaminants like fumes, dust, and vapours in order to produce a secure and healthful working environment.
The alveoli are responsible for converting carbon dioxide from the atmosphere into oxygen.
Thus, Only once ventilation has been achieved is the firefighters attempt to enter a structure.
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The answer is b that it is B
Algonquin and Sioux is what I think I am pretty sure that is the answer i might be wrong tho
Andes Mountain stretches along the western coast of Southern America.
Answer: mad-eye-moody is an arour or a dark wizard hunter
and there are 7 books in the series
(I am a harry potter expert so if you have anymore questions they will probly be answered by me)
hope that helps!