What are coral reefs made from?
A Phytoplankton
B Tentacles
C Polyps
Polyps are tiny, soft-bodied organisms. They secrete calcium carbonate skeletons which accumulate over time, forming the structure of coral reefs. Coral polyps live in colonies, and each polyp attaches itself to a hard surface, like rocks or old coral skeletons. As they grow and reproduce, they create intricate and diverse reef formations.
Correct Answer: Polyps