Identify the respective biological functions of the most abundant protein in the animal world and the most abundant protein in the whole of the biosphere.

Step-by-step solution

The most abundant protein in the animal world is collagen, and the most abundant protein in the whole of the biosphere is Ribulose bisphosphate Carboxylase-Oxygenase (RuBisCO). Collagen functions as an intercellular ground substance. RuBisCO functions as an enzyme. Therefore, their respective functions are intercellular ground substance and enzyme. Answer: Intercellular ground substance and Enzyme