Final answer:
Early civilizations were characterized by agricultural practices, complex social hierarchies, and written language.
Step-by-step explanation:
Early civilizations were characterized by several key features. Firstly, agricultural practices were an important aspect of early civilizations. This involved cultivating crops and herding domesticated animals to produce a surplus of food. Secondly, complex social hierarchies emerged in early civilizations, where different social classes and roles were established. Finally, written language played a crucial role in early civilizations, allowing for communication, record-keeping, and the development of culture.