Answer:random sampling
Explanation:The process of the actual collection of data from a large population is done randomly so that a sample data can be used to get a representative result of the whole population.
This collection is done randomly so that the result may not be bias or be only focused on one population which may result to unreliable results.
The result need to represent the what le population at large.
The answer to this question is:
"doesn't require a quorum."
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Water is not made artificially, so when we get rid of water or pullute it, we are losing that natural recource, therefore making it limited.