Answer:
As they need to meet the requirements of the individuals and the groups.
Step-by-step explanation:
Humans mainly form communities in order to meet the requirements of the individuals and the groups. It is the requirement for the social well-being of the individual. There are some requirements of a group of people in order to thrive in society. They need to associate with each other in order to stay happy. They need to associate in order to survive for the objective of reproduction, food, resources, communication, and various other things. Thus, to meet the need of a group of people the humans need to form communities.