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%
8%
75%
0%
12
flagthe Netherlands
8%
25%
66%
0%
12
flagPakistan
20%
20%
60%
0%
10
flagthe United States
20%
11%
51%
17%
45
flagIndia
27%
14%
41%
14%
87
flagthe United Kingdom
47%
13%
39%
0%
23
flagGermany
46%
14%
32%
7%
28
flagPoland
37%
22%
29%
9%
997