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Scarcity (Noun) = shortage; not enough.
Commemorate (Verb) = to remind people of an important person or event from the past.
Hierarchy (Noun) = a system in an organisation in which people are organised into different levels of importance from highest to lowest.
Diarrhoea = an illness in which waste matter is emptied from the bowels much more frequently than normal.
Discrepancy (Noun) = a difference between two or more things that should be the same.Look at the sentence :What are the reasons for the discrepancy between girls’ and boys’ performance in school ?