5
QuizMultiple Choice

The Importance of Carbon

Question 5 • PA Human Anatomy & Physiology A 2026-2027 SMITH IC

Which statement best illustrates why carbon is so important to life on Earth?

Answer
A
Carbon occurs as a solid, a liquid, and a gas.
B
Carbon is found in both the living and nonliving worlds.
C
Carbon is stored in large quantities in fossil fuels.
D
Carbon-based macromolecules are found in living things.

Explanation

Carbon is important to life because it forms the backbone of many large molecules, including carbohydrates, proteins, fats, and DNA. These carbon-based macromolecules help build cells and carry out the processes organisms need to live. The other statements describe where carbon occurs or is stored, but not its central role in living things.

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