The blood-brain barrier is made up of

a. ependymal cells and venous blood vessels.
b. astrocyte perivascular feet and capillary endothelial cells.
c. microglial extensions and capillary endothelial cells.
d. astrocyte extensions and dural sinuses.
e. astrocyte perivascular feet and the falx cerebri.

the answer is c. microglial extensions and capillary endothelial cells.

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.

a- multicellular

b-eukaryotic

c-no cell wall

d-heterotrophic

e-autotrophic