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
0%
84%
7%
7%
53
flagGermany
7%
82%
4%
5%
197
flagDenmark
13%
82%
0%
4%
23
flagCanada
4%
80%
10%
4%
66
flagFrance
8%
80%
5%
2%
36
flagSingapore
10%
80%
10%
0%
20
flagPoland
8%
79%
5%
4%
17277
flagthe United Arab Emirates
4%
78%
8%
8%
23
flagthe United Kingdom
9%
77%
7%
3%
538
flagIndia
6%
72%
13%
5%
411
flagItaly
9%
72%
6%
12%
33
flagthe United States
8%
71%
12%
5%
1092
flagUnknown
11%
70%
11%
5%
79
flagthe Netherlands
14%
70%
8%
7%
57
flagthe Philippines
12%
70%
12%
2%
48
flagAustralia
16%
68%
12%
1%
54
flagMalaysia
10%
68%
17%
3%
29
flagNorway
10%
64%
12%
12%
50
flagSpain
19%
61%
7%
3%
26
flagPakistan
17%
48%
20%
7%
39

Gender

men79%
women81%
red
8%
7%
blue
79%
81%
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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