According to the semiconservative model of DNA replication, a completely new double helix is produced
A. after the third replication
B. after the first replication
C. after the second replication
D. after the degradation of the helix into nucleotide
E. after many replications

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.

it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.