What chemical element gives the blood of a lobster and octopus a bluish tint?

Cobalt
Manganese
Copper
molybdenum
Lobsters,octopus, snails, spiders and other creepy-crawlies have blood that uses copper for oxygen transport. This is called Hemocyanin. Oxygenation causes a color change between the colorless Cu deoxygenated form and the blue Cu oxygenated form. Vertebrates like humans , have iron based blood.
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Cobalt
Manganese
Copper
molybdenum
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