A mutation occurs in a mosquito. As a result, some of the mosquito's offspring are resistant to a chemical used to kill mosquitoes. They survive when the chemical is sprayed. Explain why the mosquito's offspring have resistance to the chemical and whether the effect of the mutation is beneficial, neutral, or harmful to the mosquitoes.

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.