Why coral and limestone are important in carbon cycle?

Coral and limestone play a crucial role in the carbon cycle by acting as long-term carbon sinks. Corals absorb carbon dioxide from the ocean to build their calcium carbonate structures, which contributes to the formation of limestone when they die and their skeletons accumulate. This process helps regulate atmospheric CO2 levels, mitigating climate change. Additionally, limestone deposits can store carbon for millions of years, thus further stabilizing the carbon cycle.