Which is the most likely function of a group of cells that contains a higher number of mitochondria? why?

respiration

transpiration

fermentation

photosynthesis

respiration

Because much energy is to be used to execute this specific movement or voluntary elicitation. Respiration requires much energy and ATP thus much mitochondria is needed. Cells with mitochondria are maximize to perform at their very best and deliver as much ATP and energy in the process.