Earlier in the day, Will learned about the kinds of changes in matter that can take place. Later that day, he made toast and buttered it, but left the butter out on the warm stove. What kind of change would most likely take place with the butter?

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.