40
QuizMultiple Choice

N/A — Exam

Question 40 • Biology

Which is the central element for all living things?

Answer
A
carbon
B
hydrogen
C
nitrogen
D
oxygen

Explanation

Carbon is the central element in the molecules that make up living things. It can form four chemical bonds, allowing it to build the complex chains and rings found in carbohydrates, proteins, fats, and DNA. Oxygen, nitrogen, and hydrogen are also important to life, but carbon forms the backbone of organic molecules.

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