Which of the following distinguishes a prokaryotic cell from a eukaryotic cell ? the presence of a nucleus, the presence of a cell membrane, the ability to interact the environment, the ability to reproduce ?

Only eukaryotes have a nucleus...all the other answers are true for both euks and proks...remember that only eukaryotes have internal membranes.

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.