Gender Roles Of Early Ancestors

这是一篇文章的outline，简要讲诉在人的演化过程中，不同性别对于一个更好的生存机会需要不同的责任来维护了社会的稳定。 

Introduction:
In ancient world, our ancestors struggled for survivals against extremely difficult nature environment and scarce food resources. In the course of human evolution, roles of male and female gradually distinguished from each other, which generally followed the pattern of male taking the responsibility of hunting and battling whereas female collected fruits and rear children. Yet, from ustralopithecus, to Homo habilis, to Homo erectus, to Neanderthal, and to Homo sapiens, gender roles also altered due to the changes in environment, food, the capacity of using tools and fire and development of social structure.
Body:
A. Introduction of the evolution process of ancestors discussed
a. Graph of the evolution process of ancestors discussed
b. Analysis of ancestors discussed: Explain the important changes happened in the evolution process related to gender roles, such as changes in environment, food, the capacity of using tools and fire and development of social structure
B. Male and female roles in ancient world: General roles & specific roles according to different time period

Conclusion:

In the evolution process discussed in this essay, different genders took different responsibilities to maintaining the stability of their society for a better chance to survive. Female generally speaking was regarded as a more important role due to the great necessity for reproduction in a hard living environment like that. Meanwhile, evolution also took place in social structures, displaying an increasing wisdom of human beings.

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