How many mitochondria are typically found in an average mammalian cell?

The correct answer highlights the variability of mitochondria in mammalian cells based on their specific function and activity levels. Different types of cells have different energy needs, and this is reflected in the number of mitochondria they contain. For instance, highly active cells, such as muscle cells and neurons, may contain a larger number of mitochondria to meet their increased energy demands, while less active cells may have fewer.

This adaptability allows cells to efficiently manage their energy requirements and ensure that they can perform their functions optimally. Therefore, stating that the number of mitochondria varies based on cell activity accurately captures this essential aspect of cellular biology.