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About 98 percent of the mass of ever...

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

A

Calcium and phosphorus

B

Phosphours and sulphur

C

Sulphur and magnesium

D

Magnesium and sodium

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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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