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Elements of Living Organisms

Question 4 • PA Human Anatomy & Physiology A 2026-2027 SMITH IC

Are used for main source of energy

Answer
A
Carbohydrates
B
Lipids
C
Proteins
D
Nucleic acids

Explanation

Carbohydrates are the body's main and most readily available source of energy. They are broken down into glucose, which cells use to produce energy. Lipids also store and provide energy, but carbohydrates are the primary source.

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