[AntonioLao]

The chemical element with atomic number 12 is known as magnesium (Mg). If it is the central atom within 4-nitrogen rings of a porphyrin structure then the resulting greenish compound is called chlorophyll. On the other hand, if the magnesium atom is replaced by an iron atom then the porphyrin becomes a heme molecule which can bind with proteins forming hemoglobin, a red oxygen carrying substance in blood of all animals with spinal column, a backbone holding the central nervous system.
The main purpose of green porphyrin is to absorb energy and as such it is stationary within a living system. These green pigments are distributed around the leaves and pine needles maximizing surface areas of exposure. Furthermore these areas display line or reflection symmetries. In contrast, the mobility of red blood cells displays point symmetries while still able to optimize their oxygen transport capacity. The critical distinction is that green porphyrin helps create oxygen while red porphyrin helps carry them. Moreover, magnesium oxide is high while iron oxide is low in its pH values. The former is found in Alka-Seltzer as milk of magnesia, the latter is dissolved in acid solutions.
These chemical facts certainly remove all doubts about Martian blood being green. Spectral analyses demonstrated the natural spectrum of magnesium falls within the green, oxygen’s falls within the red, while hydrogen shows up in violet, blue, and red. In contrast, sodium spectrum only appears in bold yellow.