_play an important role in communication between neurons, produce the material that insulates neurons, and aid cell matabolism

Answer;

-Glial cells

Explanation;

-The glial cells surround neurons and provide support for and insulation between them. They are the most abundant cell types in the central nervous system.

The Glial cells have a primary function of holding the CNS together; plays an important role in communication between neurons, produces the material that insulates neurons (myelin), aid cell metabolism.

Additionally, they help form blood-brain barrier, play a key role in the control of breathing, regulate neuronal transmission, & may play an important role in repair after brain injury.

b. a lightning bug, plug of grass, and a worm

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach