-Collagen is the most abundant protein in the animal world and Ribulose bisphosphate carboxylase-oxygenase (RUBISCO) is the most abundant protein in the whole of the biosphere.
-Collagen is the most abundant protein in the human body
-Rubisco found in the stroma of chloroplast and has Bifunctional activity (carboxylase and oxygenase)
-Low CO2 high O2 → Rubisco perform oxygenase activity.
-High CO2 low O2 → Rubisco perform carboxylase activity