15 MOST Biodiverse Regions on Earth Interesting! We’ve all heard the term “biodiversity”, but what does it actually mean? The word is used to encompass all life on Earth at every level, big and small. From fungi and bacteria to lions, tigers, and bears, every living thing has its place in the world’s ecosystems. Every inch of the Earth holds a unique biodiversity, which can be completely different from one country to the next. Join us for today’s video, as we countdown the top 15 most biodiverse regions on Earth!