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Another example is adoption by infertile couples, which is likely a nonadaptive byproduct of evolved parental instincts. Click the screenshots to read. Why does Dr, Garvey think this? And so, presto—no more sex roles.
The plant material undergoing digestion in the stomachs and intestines of large ruminant herbivores is a not-so-appetizing substance called digesta. This partially digested matter is edible to humans and rich in carbohydrates, which are pretty much absent from animal tissues. Conversely, animal tissues are rich in protein and, in some seasons, fats — nutrients unavailable in many plants or that occur in such small amounts that a person would need to eat impractically large quantities to meet daily nutritional requirements from plants alone.
If past peoples ate digesta, a big herbivore with a full belly would, in essence, be one-stop shopping for total nutrition. To explore the potential and implications of digesta as a source of carbohydrates, I recently compared institutional dietary guidelines to person-days of nutrition per animal using a 1,pound kilogram bison as a model. Using that data, I found that a group of 25 adults could meet the U. Under those circumstances, hunting could have provided total nutrition, eliminating the need to obtain protein and carbohydrates from separate sources that might have been widely spread across a landscape.
My models show that, if all 25 of the people in a hypothetical group participated in the hunt, rather than just the men, and all agreed to share when successful, each hunter would have had to be successful only about five times a year for the group to subsist entirely on bison and digesta.
