The red colour of human blood is due to

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Q: 29 (SSC/NA)
The red colour of human blood is due to

question_subject: 

Science

question_exam: 

SSC

stats: 

0,51,5,2,51,2,1

keywords: 

{'human blood': [1, 0, 0, 1], 'red colour': [1, 0, 4, 4], 'hemoglobin': [1, 0, 0, 1], 'haptoglobin': [1, 0, 0, 0], 'myoglobin': [2, 0, 0, 0], 'immunoglobulin': [1, 0, 0, 0]}