Terrestrial planet.
Terrestrial brings like us and animals live whereas as others don't satisfy any life.
Answer:
Myelin sheath
Explanation:
Myelin sheath cover the axon of neurons and act as insulator for the faster transmission of signals.
Each axon is covered by multiple myelin sheaths and the gap between myelin sheath are known as Nodes of Ranvier.
In CNS myelin sheath is composed of glial cell called as oligodendrocytes and in PNS the myelin sheath is composed of Sachwann cells (glial cells).
Matter in the plasma state have a variable volume and shape. Plasma contains ions and electrons , both of which can move around freely.
