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
yellow
answers
flagRepublic of Ireland
1%
85%
6%
6%
60
flagGermany
7%
83%
4%
4%
235
flagSweden
7%
80%
7%
3%
26
flagPoland
8%
79%
5%
4%
22775
flagCanada
5%
79%
10%
4%
74
flagthe United Arab Emirates
6%
79%
6%
6%
29
flagUnknown
9%
77%
8%
3%
858
flagthe United Kingdom
8%
77%
7%
4%
657
flagItaly
7%
76%
5%
10%
38
flagFrance
13%
75%
4%
4%
45
flagthe Netherlands
12%
72%
9%
6%
65
flagthe United States
8%
71%
11%
5%
1210
flagIndia
6%
71%
13%
5%
513
flagAustralia
12%
71%
12%
2%
70
flagMalaysia
7%
70%
20%
2%
40
flagthe Philippines
11%
69%
16%
1%
62
flagNorway
8%
68%
10%
10%
58
flagSpain
17%
65%
6%
3%
29
flagNigeria
7%
61%
15%
3%
26
flagPakistan
17%
55%
16%
7%
56

Gender

men78%
women81%
red
8%
7%
blue
78%
81%
green
8%
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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