About 98 percent of the mass of every living organism is composed fo just six elements including carbon, hydrogen , nitroge , oxygen and

Options

A. Calcium and phosphorus
B. Phosphours and sulphur
C. Sulphur and magnesium
D. Magnesium and sodium

Answer

To answer the question regarding the six elements that make up about 98% of the mass of every living organism, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Known Elements**: We start by listing the four elements that are already mentioned in the question: Carbon (C), Hydrogen (H), Nitrogen (N), and Oxygen (O).

2. **Recall the Importance of Each Element**:
- **Carbon (C)**: It is the backbone of organic molecules and is essential for the structure of proteins, lipids, carbohydrates, and nucleic acids.
- **Hydrogen (H)**: It is a component of water (H2O) and organic molecules, playing a crucial role in energy transfer and metabolic processes.
- **Nitrogen (N)**: It is a key element in amino acids (the building blocks of proteins) and nucleic acids (DNA and RNA).
- **Oxygen (O)**: It is vital for respiration and is also a part of water and many organic compounds.

3. **Identify the Remaining Two Elements**:
- The fifth element is **Phosphorus (P)**: It is crucial for the formation of ATP (adenosine triphosphate), which is the energy currency of the cell. Phosphorus is also found in nucleic acids and phospholipids.
- The sixth element is **Sulfur (S)**: It is an important component of certain amino acids (like methionine and cysteine) and is involved in various metabolic processes.

4. **Summarize the Six Elements**: Therefore, the six elements that make up approximately 98% of the mass of living organisms are:
- Carbon (C)
- Hydrogen (H)
- Nitrogen (N)
- Oxygen (O)
- Phosphorus (P)
- Sulfur (S)

5. **Mnemonic for Memorization**: A useful way to remember these six elements is by using the acronym "CHNOPS".

### Final Answer:
The six elements that constitute about 98% of the mass of every living organism are Carbon, Hydrogen, Nitrogen, Oxygen, Phosphorus, and Sulfur.

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