Refer to the illustration. in which two structures of a flowering plant will haploid cells be
found?

O A and C
O A and D
O A and B
O B and C

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:

d. organisms have cells with different shapes and functions.