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The Egyptian civilisation was built along the river Nile and the annual flooding of the river allowed for rich soil, meaning that crops could easily be grown. : )
I believe the answer is C.
her is this from google
"A system of temporary reference points established in the field allows users to move freely within the study area without losing the geo-referencing. It allows the user to perform the mapping of trees, deadwood, transects, repeated measurements and data verification."
