Which axis indirectly shows the relative amount of dna per cell?

The x-axis shows the relative amount of DNA per cell thought not directly. This can be seen through a histogram a specific type of a graph. Looking at the bars of the histogram you can follow peaks and dips which correspond to something like fluorescence which indirectly shows the relative amount of DNA in cell.

for 8 am not sure maybe yes?

for 9 if it is asking if the male is more or less it would be less

hope i even just a little : )

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.