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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%

81%

8%

4%

96

Germany

9%

79%

5%

3%

1202

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9%

78%

6%

4%

26279

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7%

78%

7%

5%

55

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9%

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7%

3%

51

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77%

11%

3%

210

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8%

3%

118

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9%

76%

8%

4%

686

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6%

76%

11%

4%

63

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11%

74%

9%

2%

151

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19%

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2%

2%

47

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8%

70%

12%

5%

1762

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8%

69%

14%

4%

1476

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4%

69%

17%

4%

81

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17%

64%

10%

8%

134

Nigeria

13%

62%

14%

6%

168

the Philippines

16%

60%

19%

3%

156

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