Final answer:
Primates live in groups due to the adaptive nature of social living, which allows for cooperation and mutual benefit. Female kinship and solidarity play a crucial role in holding primate groups together.
Step-by-step explanation:
Primates live in groups due to several reasons. One is the adaptive nature of social living in mammals, including primates. Living in groups allows for cooperation and mutual benefit, which are advantageous for survival and reproduction. Additionally, primate social organization is complex, with both males and females strategizing for resources and forming bonds. Female kinship and solidarity often serve as the glue that holds primate groups together. Some examples of primate group living include gorillas and chimpanzees living in family groups and orangutans typically living alone.