Question

why human's blood is red​

Answer 1

Answer:

because of the presence of a colour pigment called HAEMOGLOBIN....

Answer 2

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Blood is red because of the hemoglobin inside our red blood cells. Hemoglobin is a protein that forms a complex with iron molecules and together they transport oxygen molecules throughout the body. Iron has the property of reflecting red light and because there is so much iron in our blood, blood looks red.