The islands of Barbuda and Antigua are located in the Eastern Caribbean Sea. Their latitude is approximately 17 degrees North of the equator. The pictures show the two
islands on August 21st and September 8th of 2017. What most likely caused the
change in the two islands between these two dates?

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b tumor cells have a cell wall instead of a membrane

explanation:

tumor cells different from normal cells because tumor cells have a cell wall instead of a membrane.

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.