A negativley charged ion is the answer
Well you want the answer with the same letter in it. A.k.a 2. This means they have the same element in them
O2 (Diatomic oxygen that we breathe) and O3 (Ozone that would be deadly to breathe) have different structures.
So the answer is 2
they are called The 7 Seas
I think the answer is:
B. Chemical Change.
