Question

why is the colour of blood red​

Answer 1

Answer:

The colour of blood is red because of presence of a protein called haemoglobin and haemoglobin has a red coloured compound called heme which is crucial for carrying oxygen in the blood stream

Explanation:

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Answer 2

Answer:

The colour of blood is red because of the protein hemoglobin, which contains a red-colored compound called heme that's crucial for carrying oxygen through your bloodstream. Heme contains an iron atom which binds to oxygen; it's this molecule that transports oxygen from your lungs to other parts of the body.