Answer:
central board of secondary education located in india
Explanation:
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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Answer:
is an activity designed to test the validity of a hypothesis
Explanation:
The procedure which is carried out in order to support or validate a particular hypothesis is known as experiment. Experiments have varying goals and they always rely on the logical analysis of the experiment results.
Researchers or scientist all over the world use experimentation to support or disprove the existing theories or the new hypotheses coming up.
Answer:
Party Machine
Explanation:
As large numbers of European and Asian immigrants streamed into cities, the party machine was developed. This "hierarchical arrangement of party workers, often organized in an urban area" provided immigrants with basic services and in exchange the party could count on a loyal block of voters once the immigrants became naturalized citizens.
i was mostly active in the late 19th and early 20th centuries.
