Out door air pollution has been a problem since ancient Romans...but the industrial revouloution was when outdoor air pollution increased and it a significant problem...
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Answer:
Follows are the matching to this question:

Explanation:
While time-consuming or prone to errors mechanical adjustments to both the referential, databases could be configured with four measures to engine violations. The restricted action causes the insert, update, and removes to only be denied. Set Null to NULL sets the invalid external key, whereas Set Default to a specific core consideration specified in SQL sets a default foreign key. Its Cascade operation spreads the main changes in external keys.
First four tasks = 8 seconds
Next four tasks = 8 seconds
Last two tasks = 8 seconds
The total number of seconds to perform all tasks is 24 seconds.
The throughput, which would be the number of tasks per second, is calculated by taking the number of tasks and dividing by the number of seconds:
10 tasks / 24 seconds = 5/12 or 0.4167 tasks per second