Final answer:
The core threat to biodiversity is the combination of human population growth and resource exploitation. Habitat loss, overharvesting of resources, and introduction of exotic species are the three greatest threats. Climate change caused by human population needs for energy is predicted to become significant in the future.
Step-by-step explanation:
The core threat to biodiversity on the planet is the combination of human population growth and resource exploitation. Human population growth leads to habitat loss, overharvesting of resources, and the introduction of exotic species, which are the three greatest threats to biodiversity. Additionally, climate change, caused by human population needs for energy, is predicted to become a significant cause of extinction in the future.