The organelle responsible for providing energy to the cell is the mitochondrion.

Here's why:

* Cellular Respiration: Mitochondria are the sites of cellular respiration, a process that breaks down glucose (sugar) and converts its chemical energy into a usable form for the cell, called ATP (adenosine triphosphate).

* ATP Production: ATP is the cell's primary energy currency, powering essential processes like muscle contraction, protein synthesis, and active transport.

* Powerhouse of the Cell: The mitochondria are often referred to as the "powerhouse of the cell" because of their crucial role in energy production.

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