Would you expect older volcanoes to be seamounts or islands

I belive they're islands because when the summit of a seamount reaches the oceans surface it becomes an island. Some seamounts are islands that slipped beneath the ocean's surface after they became extinct.

cell division is not regulated in tumor cells.

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.