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

Answers by country

Cobalt
Manganese
Copper
molybdenum
answers
flagAustralia
16%
11%
66%
5%
18
flagPakistan
18%
18%
63%
0%
11
flagthe Netherlands
14%
21%
57%
7%
14
flagthe United States
21%
10%
50%
16%
55
flagIndia
26%
13%
43%
15%
122
flagthe United Kingdom
46%
18%
34%
0%
32
flagPoland
36%
23%
30%
9%
1258
flagGermany
38%
23%
26%
11%
42