"A botanical miracle is the close similarity between cholorphyll and hemoglobin. The one difference in the two structural formulas is that the hub of every hemoglobin molecule is one atom of iron, while in chlorophyll it is one atom of magnesium. Chlorophyll is green because magnesium absorbs all but the green light spectrum. Blood is red because iron absorbs all but the red.
Chlorophyll is green blood. It is designed to capture light; blood is designed to capture oxygen. I was in awe when I learned that."
I just read this in the comments of the latest post at "Way to Garden.com." Isn't it fascinating?