Final answer:
The major threat to non-human primates today is habitat loss, overharvesting, and the introduction of exotic species as a result of human population growth and resource use.
Step-by-step explanation:
The major threat to non-human primates today is habitat loss, overharvesting, and the introduction of exotic species. These threats are a direct result of human population growth and resource use. Habitat loss occurs through deforestation, damming of rivers, and other activities which destroy the natural habitat of primates. Overharvesting refers to the unsustainable hunting and capture of primates for bushmeat or the exotic pet trade. The introduction of exotic species disrupts the ecological balance and can lead to the extinction of native primates. It is important to address these threats to ensure the survival of non-human primates.