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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

4%

90%

3%

1%

65

Republic of Ireland

4%

84%

6%

4%

45

Russia

3%

80%

8%

4%

90

Germany

9%

79%

5%

3%

1131

Singapore

7%

79%

7%

3%

53

Poland

9%

78%

6%

4%

26070

Australia

7%

77%

11%

3%

209

Canada

11%

77%

8%

3%

118

the Netherlands

10%

77%

8%

4%

48

the United Kingdom

9%

76%

8%

4%

663

Unknown

6%

76%

11%

4%

63

the United Arab Emirates

19%

74%

2%

2%

47

Austria

11%

73%

8%

2%

146

the United States

9%

70%

13%

5%

1722

India

8%

69%

14%

4%

1470

Malaysia

4%

69%

17%

4%

81

Switzerland

17%

64%

10%

7%

128

Nigeria

13%

62%

14%

6%

168

the Philippines

15%

60%

19%

3%

155

Pakistan

19%

54%

15%

7%

159

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