Original sentence: However, recent research suggests that the sexual division of labor developed relatively recently and that gender roles were not always the same in early-human cultures, contradicting the theory that each sex is naturally predisposed to different types of work.Many studies investigating the spatial abilities of men and women have found no significant differences, though metastudies show a male advantage in mental rotation and assessing horizontality and verticality, and a female advantage in spatial memory.Similarly, the ability to remember the locations of underground storage organs and other vegetation would have led to an increase in overall efficiency and decrease in total energy expenditure since the time spent searching for food would decrease.Some researchers, such as Cordelia Fine, argue that available evidence does not support a biological basis for gender roles.The sexual division of labor has been proposed as an explanation for these cognitive differences.This hypothesis argues that males needed the ability to follow prey over long distances and to accurately target their game with projectile technology, and, as a result, male specialization in hunting prowess would have spurred the selection for increased spatial and navigational ability
Edited sentence: As a result, male specialization in hunting prowess would have spurred the selection for increased spatial and navigational ability.Gathering, on the contrary, necessitates behaviors of continual social interaction and object location memory.Hunting requires travel over a wide territory with much solitary scouting and reconnoitering.Males needed the ability to follow prey over long distances and to accurately target their game with projectile technology.Recent studies have found that males are better at tasks that involve spatial ability, while females have an advantage in object memory tasks.The ability to remember the locations of underground storage organs and other vegetation would have led to an increase in overall efficiency and decrease in total energy expenditure since the time spent searching for food would decrease.The sexual division of labor provides an ultimate explanation for these cognitive differences.Thus, the different tasks required in the division of labor provide an ultimate explanation for the sexually dimorphic behaviors of cognition that exist today