ep·och - noun
a period of time in history or a person's life, typically one marked by notable events or particular characteristics.
"the Victorian epoch"
Answer:
<u><em>River valley civilizations</em></u>
Explanation:
They were centred around various river valleys as their main source of livelihood and the flourished only due tiote river valley on which they were based. Like the harappan in Indus Valley, The yellow river (Huang He), the Mesopotamia around Tigris and Euphrates and the egyptian Nile.
Answer:
they adhere to certain subcultures more than others.
