Through the study of mitochondrial disorders, scientists have suggested a link between the decline of mitochondrial function and aging. what process appears to be involved in this suspected phenomenon?

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.