Which of the following elements is among the six elements that are basic to life?

• A. Sodium (Na)
• B. Iron (Fe)
• C. Chlorine (Cl)
• D. Carbon (C)

Answer: (D)

Verified step by step guidance

1. Step 1: Understand the context of the question. The six elements that are basic to life are often referred to as CHNOPS, which stands for Carbon (C), Hydrogen (H), Nitrogen (N), Oxygen (O), Phosphorus (P), and Sulfur (S). These elements are fundamental because they are the building blocks of biomolecules such as proteins, carbohydrates, lipids, and nucleic acids.
2. Step 2: Review the options provided in the question: Sodium (Na), Iron (Fe), Chlorine (Cl), and Carbon (C). Compare each of these elements to the CHNOPS list to determine which one is among the six basic elements of life.
3. Step 3: Eliminate the elements that are not part of CHNOPS. Sodium (Na), Iron (Fe), and Chlorine (Cl) are not included in the CHNOPS list, as they are not considered basic elements of life. While they play important roles in biological processes, they are not fundamental building blocks.
4. Step 4: Identify the correct answer. Carbon (C) is part of the CHNOPS list and is a basic element of life. It is essential for forming the backbone of organic molecules, including carbohydrates, lipids, proteins, and nucleic acids.
5. Step 5: Conclude that Carbon (C) is the correct answer based on its inclusion in the CHNOPS list and its critical role in the structure and function of biomolecules.