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题目材料：
Scholars have theorized that prehistoric hunter-gatherer females of the early Americas were big-game hunters.They claim that alloparenting(infant care by nonparents)and communal hunting, which appear to have deep evolutionary roots in humans,would have,respectively,freed women from childcare demands and encouraged contributions from all able individuals in driving or dispatching large animals.Moreover,the primary hunting technology of the time-the atlatl(spear-thrower)-would have encouraged broad participation in big-game hunting. Pooling labor and sharing meat were necessary to mitigate risks associated with the atlatl's low accuracy and long reloading times. Furthermore, peak proficiency in atlatl use could be achieved in adolescence, before femnales reached reproductive age,obviating a sex-biased technological constraint that would later intensify with bow-and- arrow technology.
以上解析由 考满分老师提供。
