98% of all living organisms is made up of just following number of elements.

Options

A. 25
B. 6
C. 50
D. 100

Answer

To answer the question regarding the elements that make up 98% of all living organisms, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Key Elements**:
- Living organisms are primarily composed of organic compounds. The most common elements found in these compounds are Carbon (C), Hydrogen (H), Oxygen (O), and Nitrogen (N). These four elements are essential for the formation of proteins, nucleic acids, carbohydrates, and lipids.

2. **Consider Additional Elements**:
- In addition to the primary four (C, H, O, N), two other elements are frequently found in living organisms: Phosphorus (P) and Sulfur (S).
- Phosphorus is a critical component of nucleic acids (DNA and RNA) and ATP (adenosine triphosphate), while Sulfur is found in certain amino acids and proteins.

3. **Count the Total Elements**:
- By combining these elements, we have:
- Carbon (C)
- Hydrogen (H)
- Oxygen (O)
- Nitrogen (N)
- Phosphorus (P)
- Sulfur (S)
- This gives us a total of six elements that constitute 98% of all living organisms.

4. **Select the Correct Answer**:
- Based on the analysis, the correct answer to the question is that 98% of all living organisms is made up of **six elements**: Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, and Sulfur.

### Final Answer:
The number of elements that make up 98% of all living organisms is **six**.

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