Final answer:
Social behavior is believed to have evolved from the need to reproduce and survive, according to evolutionary biology and sociobiology.
Step-by-step explanation:
The position that maintains that social behavior evolved from the need to reproduce and survive is supported by the fields of evolutionary biology and sociobiology. According to these theories, humans have basic physical drives and an evolutionary drive to continue their species. This drive explains mating behavior and actions aimed at saving the lives of others, even at one's own expense. Social behavior is believed to have evolved because it provides an evolutionary advantage in terms of survival and reproduction.