Final answer:
The potential threats include climate change, exotic species, and over-hunting in the frog's habitat.
Step-by-step explanation:
The potential threats to the survival of the frog population living on a mountainside in Costa Rica include climate change, exotic species, and over-hunting in its habitat. Climate change can alter the temperature and precipitation patterns, which can negatively affect the frogs' survival. The introduction of non-native exotic species can compete with the frogs for resources and prey on them. Over-hunting can lead to a decline in the frog population.