Answer:
2
Explanation:
3 is physical 4 is as well so it has to be 1 or 2
The Great Barrier Reef is the world's largest living structure. It is made up of around 2900 individual reefs and 900 islands. ... Climate change is perhaps the biggest threat to the Great Barrier Reef. Warmer ocean temperatures put stress on coral and lead to coral bleaching.
<span>c.) decrease in the overall world population </span>
Explanation:wichita is known as the air capital of the world