Which of the following is termed the 'rainforest of the ocean'?

Coral reefs are called the rainforests of the ocean for their immense biodiversity.

Algae are simple producers, not the reef structures that earn the title.

The blue whale is the largest animal but not an ecosystem builder like a reef.

Mangroves are vital coastal forests yet are not the feature given this name.

Reefs support about a quarter of marine species while covering a tiny share of the sea floor.

Rising sea temperatures cause coral bleaching by expelling the symbiotic algae.