What structures are you talking about?
Answer:
a. Hermann Ebbinghaus
Explanation:
Hermann Ebbinghaus (1885) was a German Psychologist who introduce the experimental study of memory, using himself as the single subject in his work.
considered society to be an association of free individuals, and said that it could not be studied in the same way as the physical world, i.e. sociology is more than the discovery of natural laws that govern human interaction
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