Before revision: The pre-classical period, which began around 1860, focused on collecting information about humans ’ use of resources, while the classical period, which began in 1954, produced anthropological studies on linguistics and biological classifications.
After revision: The pre-classical period, which began around 1860, focused on collecting information about humans ' use of resources, while the classical period, which began in 1954, produced anthropological studies on linguistics and biological classifications.