It is secondary consumer because primary consumer is a animal that is a herbavorie (cant spell) and secondary eats that herbavor, and in this case the fish who ate the plant gets eaten by the bigger carnavore fish
IT IS C
Answer:

Step-by-step explanation:

1)421x=6
x=70
2)x+6(6x)=420
x+36x=420
37x=420
x=11
3)x-6x=420
5x=420
x=84
4)x+6x=420
7x=420
x=60