Final answer:
Copper is more active than iron in single-replacement reactions and has essential biological functions.
Explanation:
Copper is more active than iron based on their behavior in single-replacement reactions and their positions in the activity series. While both metals have important functions in biological processes, copper is a more avid binder to the protein metallothionein than zinc. Additionally, when exposed to seawater, copper and tin are less active metals than iron, leading to corrosion.
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