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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%

84%

3%

3%

26

Republic of Ireland

5%

83%

5%

5%

18

Singapore

5%

82%

10%

2%

39

Canada

7%

80%

7%

3%

63

Switzerland

7%

80%

7%

3%

26

Greece

5%

80%

10%

5%

20

Poland

9%

77%

6%

4%

22123

Germany

10%

77%

4%

4%

199

Unknown

6%

76%

11%

4%

63

Australia

8%

75%

13%

2%

124

the United Kingdom

9%

73%

10%

4%

382

Indonesia

9%

72%

4%

0%

22

Austria

13%

72%

4%

4%

22

the United States

8%

69%

14%

5%

1313

India

8%

69%

14%

5%

917

the Netherlands

12%

68%

12%

8%

25

Malaysia

7%

67%

19%

3%

52

the Philippines

15%

62%

18%

1%

102

Nigeria

8%

62%

16%

4%

48

Pakistan

17%

56%

14%

7%

95

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