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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

Ukraine

5%

86%

5%

2%

36

Greece

3%

86%

6%

3%

30

Singapore

7%

80%

9%

2%

42

the United Arab Emirates

13%

80%

3%

3%

30

Germany

9%

79%

4%

3%

383

Poland

9%

78%

6%

4%

23779

Canada

6%

78%

10%

4%

75

Australia

7%

77%

11%

3%

158

Unknown

6%

76%

11%

4%

63

the United Kingdom

9%

75%

9%

4%

508

Switzerland

14%

75%

8%

2%

48

Russia

6%

75%

10%

3%

29

India

8%

70%

14%

4%

1177

Austria

12%

70%

12%

1%

54

the United States

9%

69%

13%

5%

1458

Malaysia

6%

69%

17%

3%

63

Nigeria

8%

67%

13%

5%

73

the Netherlands

12%

67%

12%

6%

31

the Philippines

15%

62%

19%

1%

126

Pakistan

17%

56%

13%

9%

123

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