Question

read the passage. the great barrier reef is the worlds largest coral reef system. it is located off the coast of australia, where it helps protect the coastline from storms. but thats only one of its important functions. the great barrier reef is like a huge underwater city made of billions of tiny organisms called coral polyps. these creatures build rocky structures that provide shelter and food for a vast ecosystem of fish, sea turtles, dolphins, and other marine creatures. without the great barrier reef, australia would not only lose a natural wonder, but also a crucial habitat for countless species. what is the main, or central, idea of the passage? the great barrier reef has been responsible for creating much debris and pollution. the great barrier reef plays a vital role in the marine ecosystem of australia. the great barrier reef provides shelter for coral polyps and other tiny marine creatures. the great barrier reef protects australias coastline from damage caused by storms.

Explanation:

The passage highlights how the Great Barrier Reef protects the coastline, provides shelter and food for a wide - range of marine life, and is a crucial habitat. All these aspects show its vital role in Australia's marine ecosystem.

Answer:

The Great Barrier Reef plays a vital role in the marine ecosystem of Australia.