Answer:
<h3>Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.</h3>
Answer:The reason that reefs are dying is human activity in some pleases
Explanation:
I think it might be the first one: hiv infections. (hope this helps!)
They are buried in the core of the structure.