is the most abundant protein in animal world and is the most abundant protein in the whole biosphere

Explanation

1. Collagen is a connective tissue and also contains the most abundant protein in the animal world.
2. RuBisCO is the most abundant protein in the whole biosphere.
3. RuBisCO is the enzyme responsible for sugar formation during the process of photosynthesis.

Final Answer

Hence option A: Collagen, RuBisCO is the correct answer.