Correct Answer: B

Rationale: The mitochondria are often referred to as the powerhouse of the cell because they are responsible for producing adenosine triphosphate (ATP), the main energy currency used by cells to perform vital functions. Through a process known as cellular respiration, mitochondria convert glucose and oxygen into ATP, water, and carbon dioxide. This process provides the energy required for muscle contraction, nerve impulses, and metabolic activities. Mitochondria also contain their own DNA, supporting the theory that they originated from ancient symbiotic bacteria, emphasizing their critical role in sustaining life.

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