In recent years, the violent crime rate among youth has risen even as sales of violent video games have declined

_____ suggested that aggression is learned by watching aggressive models

Fill in the blank with correct word

According to the text, looking for internal causes of behavior is important partly

because an evolutionary approach to understanding human behavior assumes that variation is a crucial aspect of natural selection. How does this apply to looking for internal causes of behavior? (a) Principles of natural selection apply to psychological, as well as physical, attributes in helping an organism adapt to its environment. (b) Evolutionary theory explains the variations in many important human physical characteristics. (c) Principles of natural selection dictate that humans have had the same psychological attributes throughout their evolutionary history. (d) All of the above.