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%
4%
207
flagSingapore
8%
82%
8%
0%
23
flagDenmark
13%
82%
0%
4%
23
flagthe United Arab Emirates
4%
80%
8%
8%
25
flagPoland
8%
79%
5%
4%
19462
flagCanada
5%
79%
11%
4%
72
flagthe United Kingdom
8%
78%
7%
3%
585
flagFrance
10%
76%
5%
5%
39
flagUnknown
10%
75%
9%
4%
454
flagItaly
8%
73%
5%
11%
34
flagIndia
5%
72%
13%
5%
441
flagthe United States
8%
71%
12%
5%
1139
flagthe Netherlands
13%
70%
9%
6%
61
flagAustralia
15%
70%
12%
1%
58
flagthe Philippines
12%
69%
14%
2%
49
flagMalaysia
9%
68%
18%
3%
32
flagNorway
9%
66%
11%
11%
53
flagSpain
18%
62%
7%
3%
27
flagPakistan
20%
48%
18%
6%
43

Gender

men78%
women82%
red
8%
7%
blue
78%
82%
green
7%
5%
yellow
4%
4%

Language versions

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What color is octopus blood?
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Author: Kasia
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