Those who trace the origins of social bonding to its survival value are most likely to agree that the need to belong is:

Genetically influenced.

Explanation:

Changes in the genetic make-up of an individual over time are likely are evident not by observing the individual physical traits, but also the behavioral traits. Both genetic and social influences (environmental factors) contribute to an individual’s behavior. The need to belong is a trait humans acquired from the environmental interactions with social groups. Over time these traits have been passed down to offspring who also exhibit the same trait having acquired the basic things in life. Hence, This behavior is genetically influenced since generations exhibit the same behavior of feeling the need to belong in society.                

well 1 they have there leader that controls them

portugal is the westernmost country in europe.