I don’t feel the “,” is needed in this sentence. So I assume this is not a correct sentence.
The last one is not true. Only the second statement mentions how fragile the environment is that coral reefs exist in.The first statement focuses on erosion and pollution as causing the reefs to die.
<h2>What can money do to high school students?</h2>
First of all, money can buy food so we don't starve. And Second, it can help us in our activities (if you need to buy something...)