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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Answers by country

Cobalt
Manganese
Copper
molybdenum
answers
flagAustralia
20%
10%
70%
0%
10
flagthe United States
17%
10%
51%
20%
29
flagGermany
23%
23%
46%
7%
13
flagthe United Kingdom
37%
18%
43%
0%
16
flagIndia
28%
14%
39%
16%
56
flagPoland
36%
21%
30%
10%
575