The correct descriptions about a civilization are:
- People work on large, organized projects.
- Large numbers of people live close together.
The other two options, which mention family life being centered on the production of crops and caring for herds of tame animals employing the majority of people, typically refer to agricultural societies or pastoral societies rather than civilizations as a whole. Civilizations often have a more complex social structure, including various occupations, trade, and centralized governance, beyond just agriculture and herding.