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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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Ukraine

5%

88%

2%

2%

34

Greece

3%

86%

6%

3%

29

Republic of Ireland

3%

84%

7%

3%

26

the United Arab Emirates

10%

82%

3%

3%

29

Singapore

7%

80%

9%

2%

42

Germany

9%

79%

5%

4%

355

Canada

6%

78%

10%

4%

74

Poland

9%

77%

6%

4%

23594

Australia

7%

77%

11%

3%

153

Unknown

6%

76%

11%

4%

63

the United Kingdom

9%

74%

9%

4%

495

Switzerland

16%

74%

6%

2%

43

India

8%

70%

14%

4%

1122

the United States

8%

69%

13%

5%

1445

Malaysia

6%

69%

18%

3%

59

Austria

13%

68%

13%

1%

51

Nigeria

7%

67%

13%

5%

68

the Netherlands

12%

67%

12%

6%

31

the Philippines

15%

63%

18%

1%

123

Pakistan

16%

59%

12%

8%

118

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