How is desertification related to civilization

Human activities that relate and contribute to desertification include use and expansion of agricultural lands, poor irrigation practices, and deforestation. These land uses place enormous pressure on the land because it alters its soil chemistry.

Explanation:

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.