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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reach: rather globalarthropodsbloodchemistrycuriositiesmolluscszoology

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Cobalt
Manganese
Copper
molybdenum
answers
flagAustralia
23%
13%
53%
10%
30
flagPakistan
10%
21%
52%
15%
19
flagthe Netherlands
21%
21%
52%
5%
19
flagNigeria
35%
7%
50%
7%
14
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40%
0%
50%
10%
10
flagthe United States
28%
12%
44%
14%
74
flagIndia
22%
17%
43%
16%
216
flagthe United Kingdom
38%
16%
40%
4%
49
flagGreece
14%
28%
35%
21%
14
flagPoland
35%
22%
32%
9%
1816
flagGermany
38%
24%
27%
9%
81
flagAustria
36%
31%
21%
10%
19