Question
Identify from the following reactions the reactants that undergo oxidation and reduction.
$NiO + H _2 \rightarrow Ni + H _2 O$
$NiO + H _2 \rightarrow Ni + H _2 O$
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| Phylum | Characteristics |
| (1) Mollusca | (a) Collar cells |
| (2) Hemichordata | (b) Mantle |
| (c) Trunk | |
| (d) Cnidoblasts |