Biology CLEP Prep Practice Exam

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Which of the following is the main source of energy for most living organisms?

  1. Solar energy

  2. Chemical energy

  3. Thermal energy

  4. Kinetic energy

The correct answer is: Chemical energy

Chemical energy is the main source of energy for most living organisms because it is stored in the bonds of molecules and can be released through metabolic processes to power all of life's processes. Solar energy, while a source of energy for some organisms, is not the main source of energy for most living organisms. Thermal energy and kinetic energy are energy forms typically harnessed by non-living systems and are not directly used by living organisms to produce the energy needed for survival.

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