Answers:
1. It’s starting to loose the substance that makes the coral flourish because of the seas warming/global warming.
2. The cause and threat is that a lot of animals (fish) are going to die because they’re either not gonna have enough resources to survive and they’re also going to loose refuge. And the cause is that seas are going to have more acidity and are going to start loosing oxygen.
3. Make global warming stop so the water stops overheating.