Natural Science CLEP Prep Practice Exam

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Prepare for the CLEP Natural Science Exam with our comprehensive study materials and practice questions. Test your knowledge and ace the exam by mastering key concepts.

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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What element is the driving force behind the cycle of photosynthesis and cellular respiration?

Oxygen
Carbon
Nitrogen
Hydrogen

The correct answer is: Carbon

Carbon is the key element involved in both photosynthesis and cellular respiration. Oxygen is a byproduct of photosynthesis and a necessary component for cellular respiration, but it is not the driving force in either process. Nitrogen and hydrogen are important elements for living organisms, but they are not directly involved in the cycle of photosynthesis and cellular respiration. Therefore, they are not the driving force behind the cycle.