Which term refers to the variety of life in the world or in a particular habitat or ecosystem?

The term that refers to the variety of life in the world or in a particular habitat or ecosystem is biodiversity. Biodiversity encompasses the totality of different species, genetic variations within those species, and the ecosystem variations that exist in a specific area. It is crucial for maintaining the resilience and functionality of ecosystems, allowing them to recover from disturbances and providing a range of ecosystem services that are vital for human well-being.

In the context of ecological studies, understanding biodiversity helps in assessing the health of ecosystems and the impacts of human activities on the environment. This concept is fundamental because it includes not only the number of species present but also their relative abundance and the complex interactions between them, making it a comprehensive measure of life.