Here's why:
* Biodiversity is the variety of life on Earth. It encompasses the different levels of biological organization, including:
* Genetic diversity: The variation in genes within a species.
* Species diversity: The number and abundance of different species in a given area.
* Ecosystem diversity: The variety of ecosystems in a region.
* Ecosystem diversity directly contributes to overall biodiversity. A higher number of ecosystems indicates a greater variety of habitats, niches, and interactions between organisms.
While the number of ecosystems is a useful measure, it's important to note that it's not the only one. Other factors like species richness, community structure, and functional diversity also play a significant role in understanding biodiversity.