A large number and wide range of animal and plant life in the world or in particular habitat

It seems like you're describing biodiversity. Biodiversity refers to the variety of life on Earth, including the number and variety of species, the genetic diversity within and between species, and the complexity of ecosystems. It can be measured on multiple levels, including genetic diversity, species diversity, and ecosystem diversity. Biodiversity is important because it contributes to the health of ecosystems and is valuable for its own sake. It also provides humans with many benefits, including food, medicine, and ecosystem services.