Cell membrane allows some material to pass through it while on the same time it blocks other material from entering through it
The answer for this question I will say is LESS and CIRCULAR.
https://answers.yahoo.com/question/index?qid=20081120175341AAMbjhd
Prokaryotic cells are usually smaller and simpler than eukaryotic cells. They do not have a nucleus or other membrane-bound organelles. In prokaryotic cells, the DNA, or genetic material, forms a single large circle that coils up on itself.
here is some information if you need more evidence follow the link and read the paragraph above!! I hope this helps you a lot!!!
D. He controlled variables by studying one or two traits at a time
