Why is the colour of human blood red?

examrobotsa's picture
Q: 318 (SSC/NA)
Why is the colour of human blood red?

question_subject: 

Science

question_exam: 

SSC

stats: 

0,18,5,2,18,0,3

keywords: 

{'haemoglobin': [10, 1, 0, 2], 'immunoglobin': [1, 0, 0, 0], 'heptoglobin': [1, 0, 0, 0], 'human blood': [1, 0, 0, 1], 'myoglobin': [2, 0, 0, 0], 'colour': [11, 6, 13, 28]}