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Such a capacity for complex food plant processing could be a part of a Mid-Upper Paleolithic behavioral package (2, 23, 24), with consequences for diversified subsistence strategies and de- mographic changes in these populations (25).
Here's one: good grief, don't these people write badly?
I suppose that means:
Grinding up the plants we listed would make them more digestible. This would mean they would be worth eating when other foods were in short supply. These foods might help bands of hunters stay alive and, indeed, multiply even in conditions of scarcity.