In animal world the most abundant protein is__________ while in the whole biosphere the most abundant protein is__________.

Options

A. Antibody, Collagen
B. Collagen, RuBisCo
C. RuBisCo, Collagen
D. Collagen, Oxidase

Answer

To answer the question, we need to identify the most abundant proteins in two different contexts: the animal world and the entire biosphere.

### Step-by-Step Solution:

1. **Identify the Most Abundant Protein in the Animal World:**
- In the animal kingdom, the most abundant protein is **collagen**.
- Collagen is a structural protein that is a major component of connective tissues, skin, bones, and cartilage in animals.
- In humans, for instance, collagen makes up about 30% of the total protein content.

2. **Identify the Most Abundant Protein in the Whole Biosphere:**
- In the entire biosphere, the most abundant protein is **rubisco** (ribulose-1,5-bisphosphate carboxylase/oxygenase).
- Rubisco is crucial for the process of photosynthesis in plants, where it facilitates the fixation of carbon dioxide, making it essential for life on Earth.

3. **Final Answer:**
- Therefore, the answers to the blanks in the question are:
- In the animal world, the most abundant protein is **collagen**.
- In the whole biosphere, the most abundant protein is **rubisco**.

### Summary:
- The most abundant protein in the animal world is **collagen**.
- The most abundant protein in the whole biosphere is **rubisco**.