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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%

3%

1%

53

Republic of Ireland

2%

85%

7%

4%

41

Singapore

7%

79%

7%

3%

53

Poland

9%

78%

6%

4%

25290

Germany

9%

78%

5%

3%

795

Australia

7%

78%

10%

3%

191

Canada

9%

78%

8%

3%

107

Russia

3%

78%

8%

5%

60

Unknown

6%

76%

11%

4%

63

the Netherlands

9%

76%

9%

4%

42

the United Kingdom

9%

75%

9%

4%

622

the United Arab Emirates

17%

75%

2%

2%

45

Austria

10%

73%

9%

2%

119

the United States

9%

70%

13%

5%

1636

India

8%

69%

14%

4%

1402

Malaysia

5%

69%

15%

5%

76

Switzerland

17%

68%

9%

4%

91

Nigeria

11%

63%

16%

6%

150

the Philippines

14%

60%

20%

4%

150

Pakistan

19%

55%

14%

8%

150

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