In an environment of plenty where group cooperation is not necessary to create the minimal sustenance necessary for any individual to live such as in the African plains when your food is literally walking by you everyday then selfish behavior is more rewarding because you really just want to stop the other guy from stealing your food that's walking by your house everyday. In an environment where cooperation is required for anyone to survive such as in a colder climate where a lot of energy must be created by more than one individual to create shelter food stores and other things necessary for anyone to survive then unselfish behavior rewards the whole group and is therefore rewarded in evolution.
In an environment of plenty where group cooperation is not necessary to create the minimal sustenance necessary for any individual to live such as in the African plains when your food is literally walking by you everyday then selfish behavior is more rewarding because you really just want to stop the other guy from stealing your food that's walking by your house everyday. In an environment where cooperation is required for anyone to survive such as in a colder climate where a lot of energy must be created by more than one individual to create shelter food stores and other things necessary for anyone to survive then unselfish behavior rewards the whole group and is therefore rewarded in evolution.
(post is archived)