How has the system of classifying organisms changed since Linnaeus’s work? Levels have been taken away from the hierarchy.
Organisms have been identified simply as plants or animals.
More levels have been added to the hierarchy.
A hierarchy has been developed.

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

it's c (engineer's do their work with mechanical stuff not on any living being)