Respuesta :
True. Excavations in the city of York revealed that a shift from clean water species (shad, grayling) to species more tolerant of polluted water (perch, roach) occurred around the 10th century AD when the Viking town underwent rapid development.
How does excavations help archaeologists?
Archaeologists define, recover, and record cultural and biological remnants discovered in the ground through the process of archaeological excavation. House foundations, burials, artifacts, bones, seeds, and many more remnants of past activity are evidence of human experience. Depending on the type of site and geology, these strata can persist in a variety of ways (hilly, lowland, wet, dry, acid, etc., known as the terrain ). The degree to which the remnants of the past have already decomposed or been disturbed by later actions, such as building or farming, also affects their chances of survival and visibility.
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