Final answer:
The cost of splitting and reanalyzing a portion of a sample is usually the responsibility of the party requesting the reanalysis.
Step-by-step explanation:
When a portion of a sample is split and reanalyzed, the cost usually falls on the party requesting the reanalysis. This could be the researcher or organization conducting the study, or the individual or entity that requires the additional analysis.
For example, in a scientific experiment, if the original sample is divided into two groups and one group needs further testing for validation or verification, the cost of reanalyzing that portion of the sample would likely be the responsibility of the researcher or organization conducting the experiment.
It's important to note that the specific circumstances and agreements between parties involved may determine who bears the expense of reanalysis.