In societies, the basic social unit is the kinship group or family. people do not have private households or residences. instead, they live in small groups of about twenty-five to forty people.

Hunting and gathering

Explanation:

In Hunter-gatherer societies food is obtained by hunting fauna and gathering the flora which grows naturally in a region. The food is not obtained via agriculture.

Due to the foraging habits of Hunter-gatherer's they consume all the resources of the region and move to another region. They are grouped according to kinship. The nature of marriage they have is initially matrilocal where the child is cared for by the women of the mother's family.

c is the answer for this

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.