Final answer:
A classical period in a civilization requires the development of a written language, governance based on religious or philosophical teachings, and extraordinary achievements in art and science.
Step-by-step explanation:
In order for a particular time in a civilization to be considered a classical period, several key factors must be present. Firstly, a written language must develop and be used by the population, as it allows for the preservation and sharing of knowledge. Secondly, the rulers must govern according to religious or philosophical teachings, which gives the civilization a cohesive identity and moral framework. Lastly, the civilization must make extraordinary achievements in areas such as art and science, showcasing a high level of cultural sophistication and intellectual advancement.
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