The Rule of 70 says that if one divides 70 by the percent value of
growth (expressed as a whole
number), the result will equal the
time needed for a population to
A. double
B. maintain zero population growth
C. triple
D. collapse

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.