Question

what is before blood colour ​

Answer 1

Answer:

The iron reacts with oxygen, giving blood its red color. Although veins appear blue through the skin, blood is not blue. The reason why veins might seem to be blue may have to do with the level of oxygen in the blood.

Explanation:

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Answer 2

Explanation:

The iron reacts with oxygen, giving blood its red color. Although veins appear blue through the skin, blood is not blue. The reason why veins might seem to be blue may have to do with the level of oxygen in the blood.