Final answer:
Coral restoration significantly enhances biodiversity surrounding a reef by providing new habitats, improving ecosystem health, restoring marine organism populations, and promoting diverse marine growth.
Step-by-step explanation:
Coral restoration has a profound impact on the biodiversity surrounding a reef. The correct response to how coral restoration affects biodiversity is both A) It enhances biodiversity by providing new habitats for various marine species, and B) It improves the overall health of the reef ecosystem, leading to an increase in biodiversity. Further supporting explanations include C) It helps to restore the populations of fish and other marine organisms that rely on coral reefs and D) It promotes the growth of other marine organisms, contributing to a more diverse ecosystem. The intervention is critical as coral reefs are vital marine ecosystems, home to a third of the world's marine fish species and act as foundation species. When reefs degrade, species diversity drops significantly, with repercussions for ecosystems and economies reliant on tourism.