3 poi
Which structure
has a role in both the excretory and reproductive
systems?

The excretory and reproductive systems are closely interlinked. Both share certain common passages such as in males where urinary tract gives passage to both urine and semen. Although in females these are seperate, the urinary bladder is present posterior to the uterus and very close.

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.