Multiple Choice
Which of the following vitamins aids in the absorption of the mineral iron?
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4. Biomolecules
Introduction to Biomolecules
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Which of the following substances was once part of living material?
A
Wood
B
Water (H$_2$O)
C
Iron ore
D
Salt (NaCl)
Verified step by step guidance1
Step 1: Understand the question by identifying the key concept. The question asks which substance was once part of living material, so we need to focus on the biological origin of the substances listed.
Step 2: Analyze each option. Wood is derived from trees, which are living organisms, so it qualifies as a substance that was once part of living material.
Step 3: Evaluate the other options. Water (H₂O) is a molecule essential for life but is not derived from living material itself. Iron ore is a mineral found in the Earth's crust and is not biologically derived. Salt (NaCl) is also a mineral and not part of living material.
Step 4: Apply the concept of living material. Living material refers to substances that originate from organisms, such as plants, animals, or microorganisms. Wood fits this definition because it comes from trees, which are living organisms.
Step 5: Conclude that the correct answer is wood, as it is the only substance listed that was once part of living material.
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