The term for the variety and variability of different organisms is biodiversity. It encompasses the full range of species, genetic diversity within those species, and the variety of ecosystems that host them. Biodiversity is essential for ecosystem stability, resilience, and productivity. High biodiversity can enhance ecosystem services, such as pollination, water purification, and nutrient cycling. Efforts to conserve biodiversity are crucial in combating issues like habitat loss and climate change, ensuring that ecosystems can continue to function effectively and support human life.