Carlos made a diagram to compare two kinds of fish.
Which label belongs in the area marked Z?
O
O
Ray
Hagfish
Scales
No jaw
Swim bladder
Skeleton made of bones
O
Save and Exit
Next
Sub

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.