The endosymbiosis theory proposes that I
and
originated from bacteria that took up residence within a
primordial eukaryotic cell.

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.

burning fossil fouls really decrease the carbon in the atmosphere so b