21.
Which of the following are characteristics of the social structure of the society?
1. A society has a structure of interrelated roles.
2. Society is a special type of group with a comprehensive social system.
3. A society tends to survive for a long period.
4. A society is economically self-sufficient.
Select the correct answer:

22.
Who made a distinction between 'class in-itself' and 'class for itself' to reflect the movement from a class's potential self-awareness to actual self-awareness?