Which type of diversity is hardest to measure precisely?

Biodiversity
Ecosystem biodiversity
species diversity
genetic diversity

Biodiversity is the type of diversity that is hardest to measure precisely. Biodiversity refers to the variety of all life forms on Earth, including species diversity, genetic diversity, and ecosystem biodiversity. It encompasses the differences in ecosystems, species, and genetic composition within and among different regions and habitats. The complexity and vastness of biodiversity make it challenging to accurately measure and quantify all aspects of it.