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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

the United Arab Emirates

7%

85%

3%

3%

27

Republic of Ireland

5%

84%

5%

5%

19

Singapore

5%

82%

10%

2%

39

Switzerland

6%

82%

6%

3%

29

Canada

7%

80%

9%

3%

65

Greece

5%

80%

10%

5%

20

Germany

10%

78%

4%

4%

238

Poland

9%

77%

6%

4%

22439

Unknown

6%

76%

11%

4%

63

Australia

8%

75%

13%

2%

127

the United Kingdom

9%

73%

10%

4%

402

Indonesia

9%

72%

4%

0%

22

India

8%

70%

14%

4%

973

the Netherlands

11%

70%

11%

7%

27

the United States

8%

69%

13%

5%

1336

Malaysia

7%

68%

18%

3%

54

Austria

11%

67%

14%

2%

34

Nigeria

8%

64%

16%

4%

50

the Philippines

14%

62%

19%

1%

107

Pakistan

20%

56%

14%

7%

100

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