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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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the United Arab Emirates

8%

82%

4%

4%

23

Singapore

6%

81%

9%

3%

33

Germany

6%

80%

5%

6%

78

Canada

7%

80%

9%

3%

55

Poland

9%

77%

6%

4%

20630

Unknown

6%

76%

11%

4%

63

Mexico

7%

76%

15%

0%

13

New Zealand

0%

76%

15%

0%

13

Switzerland

10%

73%

10%

5%

19

Indonesia

9%

71%

4%

0%

21

the United Kingdom

9%

70%

12%

4%

324

India

8%

69%

15%

5%

759

Australia

10%

69%

16%

3%

95

the United States

9%

68%

14%

5%

1204

Malaysia

7%

67%

22%

2%

40

the Philippines

13%

65%

18%

1%

90

Spain

6%

60%

6%

13%

15

Nigeria

9%

58%

19%

4%

41

Pakistan

17%

56%

16%

7%

81

the Netherlands

16%

55%

16%

11%

18

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