The term for large amounts and variety of organisms in a given area is called 'biodiversity.'
Biodiversity encompasses the different species, genetic variations, and ecosystems found in a specific region. It is a crucial measure of the health of the ecological system because a diverse set of organisms can contribute to resilience against environmental changes and threats. High biodiversity often indicates a stable and well-functioning ecosystem. Preserving biodiversity is essential for maintaining the balance of the environment and for providing resources and services necessary for survival.