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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

4%

92%

4%

0%

25

Greece

3%

85%

7%

3%

27

Singapore

5%

82%

10%

2%

39

the United Arab Emirates

10%

82%

3%

3%

28

Canada

7%

80%

9%

2%

71

Germany

9%

78%

5%

4%

298

Poland

9%

77%

6%

4%

23124

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8%

76%

13%

2%

135

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6%

76%

11%

4%

63

Switzerland

13%

76%

7%

2%

38

the United Kingdom

9%

74%

9%

4%

441

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9%

72%

4%

0%

22

India

8%

70%

14%

4%

1065

the United States

9%

69%

13%

5%

1388

the Netherlands

10%

68%

13%

6%

29

Malaysia

7%

67%

19%

3%

56

Austria

15%

64%

15%

2%

45

Nigeria

7%

63%

15%

7%

57

the Philippines

15%

61%

20%

1%

114

Pakistan

19%

58%

13%

6%

105

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