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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 haemoglobin oxygen transportation.

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Answers by country

Republic of Ireland

2%

88%

5%

2%

34

Ukraine

6%

87%

4%

2%

47

Singapore

6%

81%

9%

2%

43

Russia

5%

80%

7%

5%

40

Canada

6%

79%

10%

3%

82

Poland

9%

78%

6%

4%

24522

Germany

10%

78%

4%

4%

520

Australia

8%

76%

11%

3%

168

Unknown

6%

76%

11%

4%

63

Austria

11%

75%

10%

1%

78

the Netherlands

9%

75%

9%

4%

41

the United Arab Emirates

15%

75%

3%

3%

33

the United Kingdom

9%

74%

9%

4%

559

Switzerland

18%

72%

7%

1%

65

India

8%

70%

14%

4%

1277

Malaysia

5%

70%

15%

5%

71

the United States

8%

69%

13%

5%

1544

the Philippines

15%

62%

18%

2%

134

Nigeria

11%

61%

16%

6%

109

Pakistan

20%

52%

14%

8%

134

Which blood group is known as "universal donor"?

Which blood type is the least common?

Which protein causes blood to clot?

What is brass composed of?

copper and iron

copper and zinc

copper and lead