If a cell has a cell membrane, it is ... A. eukaryotic.

B. prokaryotic.

C. can be either prokaryotic or eukaryotic.

D. none of these have a cell membrane.

d. none of these have a cell membrane

Explanation:

i think it is that sorry if i get it wrong

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

answer: the answer is b