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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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4%

89%

4%

1%

66

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84%

6%

4%

45

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3%

80%

8%

4%

91

Germany

9%

79%

5%

3%

1164

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7%

79%

7%

3%

54

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9%

78%

6%

4%

26182

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77%

11%

3%

209

Canada

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8%

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118

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10%

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8%

4%

49

the United Kingdom

9%

76%

8%

4%

670

Unknown

6%

76%

11%

4%

63

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11%

74%

8%

2%

147

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19%

74%

2%

2%

47

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8%

70%

13%

5%

1736

India

8%

69%

14%

4%

1473

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4%

69%

17%

4%

81

Switzerland

16%

63%

10%

8%

130

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