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珊瑚礁如何历经数百年建成巨大结构？

Coral reefs grow slowly as tiny marine animals called polyps secrete calcium carbonate skeletons around themselves for protection.
Each polyp lives in symbiosis with algae called zooxanthellae, which provide up to 90% of the coral’s energy via photosynthesis.
Reef-building corals thrive only in warm, shallow, clear, sunlit waters — typically within 30° of the equator and less than 50 meters deep.
Growth rates vary by species: branching corals may add 10 cm per year, while massive ones grow less than 1 cm annually.
Over centuries, dead coral skeletons accumulate, providing foundations for new generations to settle and expand upon.
Fish, worms, and crustaceans bore into old structures, while parrotfish grind coral into sand — shaping reef morphology dynamically.
Ocean acidification reduces carbonate ion availability, weakening skeletons and slowing reef growth globally.
Despite covering less than 0.1% of the ocean floor, reefs support nearly 25% of all marine species — highlighting their ecological importance.

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Ocean acidification reduces carbonate ion availability, weakening skeletons and slowing reef growth globally. 海洋酸化降低了碳酸根离子浓度，削弱珊瑚骨骼，减缓全球珊瑚礁生长。
Over centuries, dead coral skeletons accumulate, providing foundations for new generations to settle and expand upon. 历经数百年，死亡珊瑚的骨骼不断堆积，为新一代珊瑚提供附着和扩展的基础。
Coral reefs grow slowly as tiny marine animals called polyps secrete calcium carbonate skeletons around themselves for protection. 珊瑚礁由微小的海洋动物——珊瑚虫分泌碳酸钙骨骼缓慢形成，用以自我保护。

这篇中文题目最接近哪一句？珊瑚礁如何历经数百年建成巨大结构？一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？珊瑚礁由微小的海洋动物——珊瑚虫分泌碳酸钙骨骼缓慢形成，用以自我保护。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） How Coral Reefs Build Massive Structures Over Centuries How to cook noodles A maths worksheet

Ocean acidification reduces carbonate ion availability, weakening skeletons and slowing reef growth globally.

Ocean acidification reduces carbonate ion availability, weakening skeletons and slowing reef growth globally.

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例子：Ocean acidification reduces carbonate ion availability, weakening skeletons and slowing reef growth globally.