Why does the shell vary between islands that are so close together?

Would really appreciate it, i have an idea but not completely sure

Witch type of microscope is used to view very small cell components like proteins and dna?

Can bacteria reproduce in a way such that when you start out with two bacteria, you get five bacteria? why or why not? * a. yes, because bacteria reproduce sexually, and can produce any number of offspring, just as humans do. b. no, because bacteria grow at an exponential rate. c. no, because when bacteria reproduce, they split into two parts, and two bacteria splitting would result in four bacteria.