response: I am not sure, but the red color of blood comes from the protein hemoglobin.
original_response: i am not sure but,  The red colour of blood comes from protein hemoglobin
history: I love the color Red! It is so bright and vibrant! Oh, that's nice. It actually sits at the end of the spectrum of visible light. What 2 colors can you mix together to make red?
knowledge: The red colour of blood comes from protein hemoglobin, while ripe strawberries, red apples and reddish autumn leaves are colored by anthocyanins.