Groups and teams are very different. In teams, each individual has a specific job, like parts in a machine. Groups are more like herds that form a sort of unified consciousness wherein individuality is subsumed.

Men do teams better, while women are more group oriented. In teams, individual IQ/talent is salient, because a team is only as strong as its weakest part. In groups, it doesn’t matter so much because the group’s strength is based on numbers.

If you think about it in a hunter gatherer context this is an important distinction. Say the men are going hunting, and they consist of a bowman with great eyesight and good aim, a young, agile runner to harry and flush out the game, a big, strong man to spear/finish off larger, more dangerous game, and leading the team a wise, older hunter with decades of experience who knows the animal behavior, territory and seasons better than anyone else.

In this scenario the team is greater than the sum of its parts, because alone none of the hunters could bag a large animal like a moose, and alone none could have access to a wide variety of game. Even the loss of one member would cripple the team, because each plays an important role. Combined into a game killing team/machine, they increase the amount of meat bagged per hunter and decrease the likelihood of a serious injury.

Meanwhile the women are foraging for roots and berries in a meadow. Young and old, short and tall, fast and slow, stupid and smart all together doing the same thing. The individual distinctions matter little. What is important is that everyone is on the same page, singing the same note. Often, they are in fact singing together as they work. If individuality disrupts this harmony, it must be suppressed. If one individual has to be cast out, it doesn’t matter much because the group’s effectiveness lies in unity and cohesion.

The group can gather more food because it suppresses individuality, which would only result in squabbling, hostility and disruption of workflow.

Hence we can envision the origins of human division of labor by sex, the roots of which are deeper in time than the emergence of our species.