What do the terms "fission" and "fusion" refer to in hunting-and-gathering societies?

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Fission refers to the splitting up of a larger group into smaller ones due to a decrease in available resources or other factors, while fusion refers to the merging of smaller groups into a larger, more cohesive group in times of plenty. This cyclical change in population density relative to resources is a common phenomenon in hunting-and-gathering societies.

What Do the Terms "Fission" and "Fusion" Refer to in Hunting-And-Gathering