What color is octopus blood?

red
blue
green
yellow
Both squids and oc­to­pus­es have blue blood. They use an oxy­gen-­car­ry­ing molecule in their blood called hemo­cyanin that contains copper. In cold con­di­tions with low oxygen pres­sure, hemo­cyanin oxygen trans­porta­tion is more ef­fi­cient than he­mo­glo­bin oxygen trans­porta­tion.

Answers distribution

red
blue
green
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answers
flagRepublic of Ireland
1%
84%
7%
7%
57
flagGermany
7%
82%
4%
5%
199
flagDenmark
13%
82%
0%
4%
23
flagFrance
8%
80%
5%
2%
36
flagSingapore
9%
80%
9%
0%
21
flagPoland
8%
79%
5%
4%
17729
flagCanada
5%
79%
10%
4%
69
flagthe United Arab Emirates
4%
79%
8%
8%
24
flagthe United Kingdom
9%
77%
7%
3%
555
flagUnknown
11%
74%
9%
3%
105
flagIndia
6%
72%
13%
5%
426
flagItaly
9%
72%
6%
12%
33
flagthe United States
8%
71%
12%
5%
1112
flagAustralia
15%
70%
12%
1%
58
flagthe Netherlands
14%
70%
8%
7%
57
flagthe Philippines
12%
70%
12%
2%
48
flagMalaysia
9%
70%
16%
3%
31
flagNorway
9%
64%
11%
11%
51
flagSpain
19%
61%
7%
3%
26
flagPakistan
20%
47%
20%
7%
40

Gender

men79%
women82%
red
8%
7%
blue
79%
82%
green
7%
5%
yellow
4%
4%

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What color is octopus blood?
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Author: Kasia
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