2 Points
Which role do fish ladders serve?
O
A. They allow fish farmers to raise certain kinds of fish.
O
B. They help some kinds of fish migrate past dam barriers.
O
C. They improve the nutritional value of some kinds of fish.
O
D. They help certain kinds of fish stay physically fit.

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

B. a graduated substance