Final answer:
Sperm cells obtain the energy necessary for their activity from the organelles called mitochondria.
Step-by-step explanation:
Sperm cells require a large amount of energy to maintain their activity, and this energy is provided by the organelles called mitochondria. Mitochondria are often referred to as the 'powerhouses' or 'energy factories' of the cell because they produce adenosine triphosphate (ATP), the main energy-carrying molecule in cells. Sperm cells have a high concentration of mitochondria in their midpiece, which generates the energy needed for the movement of the tail and propulsion of the sperm.