Which monomer serves as the building block of glycogen, a polymer made up of many glucose molecules? A. Amino acid,
B. Monosaccharide,
C. Nucleotide,
D. Steroid

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:

supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes

i wish i could with all of them i can barley see the first one so here's the answer to the first one b