Are a group of mollusks that became more abundant and important parts of reefs.

Bivalvia

Explanation:

Bivalvia is the group of mollusks that is one of the important parts of coral reefs. The mollusks belonging Bivalvia flourished during the Mesozoic era. Rudistids are the bivalve mollusks that served as a major part of coral reefs and gave rise to Rudistid reefs. After the mass extinction that occurred in the Mesozoic era, bivalves again served as one of the dominant reef-forming organisms

idk why hjggjhjkhj

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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