Define cell and atom​

cell is made of molecules whereas atoms make up molecules. Cells are the smallest functioning unit in a living organism

a cell is the basic structural, functional, and biological unit of all known organisms.

an atom is the smallest unit into which matter can be divided without the release of electrically charged particles

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.