I believe the answer is A im not sure but to me it sounds right.
Answer:
Blood-brain barrier.
Explanation:
Blood brain barrier may be defined as the barrier between the blood capillaries and the component of the brain tissue. This blood brain barrier provide protection against the pathogens present in the blood.
The blood-brain barrier uses tight junctions that prevent the entry of microbes in the underlying tissue. The tight junctions allows only the entry of some selected particles and prevent the entry of other particles.
Thus, the correct option is (3).
B Is the answer djdkekksksksklsls
Answer:
True
Explanation:
All living things have more than one cells that help function the organ system
