Which example is indicative of a high biodiversity environment?

A coral reef is indicative of a high biodiversity environment due to the complex and varied ecosystems that exist within and around them. Coral reefs are often referred to as the "rainforests of the ocean" because they support a vast array of marine life. This includes numerous species of corals, fish, invertebrates, and other organisms that interact in various ways, contributing to a rich web of ecological relationships. The structural complexity of coral reefs provides habitats for a diverse range of species, fostering significant biological diversity.

In contrast, other environments listed, such as deserts, monoculture farms, and barren rock surfaces, tend to have much lower levels of biodiversity. Deserts may support specialized species adapted to harsh conditions but generally do not host the same variety of life forms found in coral reef ecosystems. Monoculture farms, which focus on a single crop, reduce genetic diversity and typically support fewer species overall. Similarly, a barren rock surface has minimal life, typically limited to hardy organisms that can survive in extreme conditions, making it one of the least biodiverse environments. Thus, the abundance and variety of life in coral reefs exemplify a high biodiversity environment.