Question
Explain the evolution of human beings.
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| Metal | Iron $(II)$ sulphate | Copper $(II)$ sulphate | Zinc sulphate | Silver nitrate |
| $A$ | No reaction | Displacement | ||
| $B$ | Displacement | No reaction | ||
| $C$ | No reaction | No reaction | No reaction | Displacement |
| $D$ | No reaction | No reaction | No reaction | No reaction |