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About 98 percent of the mass of every li...

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

A

S and Mg

B

Mg and Na

C

Ca and P

D

P and S.

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To solve the question regarding the 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 Given Elements**: The question states that the mass of living organisms is composed of six elements, and it mentions four of them: carbon (C), hydrogen (H), nitrogen (N), and oxygen (O). 2. **Recall the Common Elements in Biology**: In biological systems, the most common elements that constitute the majority of the mass are typically C, H, O, and N. 3. **Determine the Missing Elements**: We need to identify the other two elements that, along with C, H, O, and N, make up the remaining 98% of the mass of living organisms. 4. **Consider Biological Functions**: - **Phosphorus (P)**: This element is crucial as it is a part of nucleic acids (DNA and RNA) and is also found in ATP (adenosine triphosphate), which is the energy currency of the cell. Additionally, phosphorus is a component of bones and teeth. - **Sulfur (S)**: Sulfur is important in the structure of certain amino acids (like cysteine and methionine) and is involved in the formation of proteins and enzymes. 5. **Conclude the Answer**: Therefore, the two additional elements that complete the list of the six elements making up about 98% of the mass of living organisms are phosphorus (P) and sulfur (S). 6. **Final Answer**: The six elements are Carbon (C), Hydrogen (H), Nitrogen (N), Oxygen (O), Phosphorus (P), and Sulfur (S).
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