Final answer:
Illegal hunting of primates for bush-meat at unsustainable rates is an example of overharvesting, which is one of the primary factors contributing to global biodiversity loss.
Step-by-step explanation:
The illegal hunting of primates for bush-meat at rates that are unsustainable is a form of overharvesting, which is one of the primary factors that explain global biodiversity loss. Overharvesting occurs when resources, such as animals, are removed from the environment at a rate that exceeds their ability to reproduce and replenish their populations. The demand for bush-meat, driven by expanding human populations seeking new sources of protein, has resulted in the endangerment and extinction of many primate species.