A) A metal forms a + charged ion, so D2+
B) A nonmetal forms a - charged ion, so A-
C) C2-
D) B+
The fertilizers used by farmers can have negative effects on aquatic ecosystems because there is every possibility that the runoffs from the fields can create an algal bloom in the nearby water body. This algal bloom can have a very negative effect on the living organisms of the aquatic body. I hope it helps.
They are formed into polymers.
