Most of the loss of biodiversity in ecosystems is caused by

While water pollution negatively affects aquatic ecosystems and can lead to the decline of specific species, it is not the leading cause of biodiversity loss overall. Pollution can cause health issues in organisms and disrupt food chains, but habitat destruction fundamentally alters the living conditions necessary for many species to exist.

Hunting and fishing can contribute to local declines in certain species, particularly those that are overexploited. However, while these practices can threaten individual species, they are less impactful on overall biodiversity compared to the widespread habitat loss that occurs through land development and resource extraction.

Agricultural runoff can lead to issues such as eutrophication and contamination of water sources, impacting aquatic life and surrounding ecosystems. Nevertheless, the broader and more critical issue remains habitat destruction, which encompasses the loss of land necessary for wildlife habitat, nesting, and food sources.