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A nonexperimental research design can answer all of the following questions, EXCEPT:
Microglia
Glial cells that originate in the blood, aid in cell repair, and scavenge debris in the nervous system.
Astrocytes
Star-shaped glial cells in the brain and spinal cord that play a crucial role in supporting neurons, forming blood-brain barrier, and regulating neurotransmitters.
Schwann Cells
Specialized cells in the peripheral nervous system responsible for the formation of myelin, which speeds up the electrical impulses in neurons.
Ependymal Cells
Glial cells that line the ventricles of the brain and the spinal cord, involved in the production of cerebrospinal fluid.
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