Which part of the nervous system maintain homeostasis by providing nutrients and support to living neurons while also digest dead neurons?

a. glial cells
b. tracts in the cns
c. spinal nerves
d. meninges

(i think its c but idk)

Which is not a characteristic of bacteria? a. they are unicellular. b. they are prokaryotic. c. they are the smallest form of life on earth. d. they are multicellular.

12) several teeth were found in an area of flat land covered with trees and plants. the teeth were examined by a paleontologist, and it was determined that the teeth came from a shark. they found many other shark teeth in this area. however, the people who discovered the teeth were puzzled, because there was no source of water near where the fossils were found. what is the paleontologist's best explanation for why the teeth were found in this area? a) sharks used to live on flat land. b) this area was once covered with salt water. c) this area was once covered with freshwater. d) someone buried the shark teeth deep in the ground.

Which muscle cell structure stores calcium ions that are used to trigger the contraction?