Answer:
Harmful
Explanation:
When you have an autoimmune disorder, your immune system does not distinguish between healthy tissue and potentially harmful antigens.
PH Level, and food source such as sugar.
Answer:
A reaction that joins the nuclei of two atoms into one
Explanation:
Think of the words "nuclear fusion".
Nuclear = "relating to a nucleus"
Fusion = "joining"
So, nuclear fusion is the joining of two nuclei into one.
A and B are wrong, because chemical reactions involve electrons.
D is wrong, because the splitting of a nucleus is fission.
.........gold??..........its a guess