 Lack of attention to changing environments. There is a lack of good information about the environment, including the social environment, in which humans evolved. We know that there are differences among the environments in which people currently live and between current environments and early human environments. Postulating evolutionary adaptations only makes sense in reference to a particular environment because adaptations are responses to particular environmental challenges. A behavior may be an adaptation to a past environment and not benefit individuals in a current environment. Alternatively, a behavior may benefit an individual without being the result of natural selection for that benefit. As a result, conclusions drawn about the evolution of human behavior need to be tentative.