Los océanos: mares de coral

Coral reefs are vibrant marine habitats, among the largest living structures on Earth. They begin with a coral larva that grows into a polyp and forms colonies. Sunlight is vital for reefs due to the symbiotic relationship between coral polyps and algae, which perform photosynthesis. Polyps feed on plankton at night. Reefs host diverse species, forming symbiotic relationships, such as crabs defending coral. However, reefs face threats from storms, pollution, and climate change, making them critical yet vulnerable ecosystems.

Describe the symbiotic relationships that exist within coral reef ecosystems.

What are some threats to coral reefs as mentioned in the text?