I would say B because of their population
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.
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Congress can veto a proposal with a 2/3 majority vote of members in both the house in the senate.
Hope this helps! :D
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What is this a part of?Comment and I can try to help.