Answer:
Oligodendrocytes in the brain and spinal cord and Schwann cells in the peripheral nervous system are specialized types of glia that build the myelin sheaths that surround neurons.
Explanation:
Myelin sheath is an insulating layer, which covers neurons. It is made up of protein and fatty substances. This myelin sheath permits electrical impulses to move very fast along the neurons.
They are biogeochemical cycles
<span>The answer is d. front. A front is the narrow region between two air masses of different densities. The interaction of the air masses cause the mass that is less dense to rise. Once air rises it cools and condenses to form clouds and eventually leads to precipitation. Using cold fronts as an example, the denser mass of cold air forces the lighter warm air to rise. </span>
Prophase (chromatin condense into chromosomes)
<span>Prometaphase (chromosomes start to move to the center) </span>
<span>Metaphase (chromosomes lined up at the center) </span>
<span>Anaphase (chromosomes split at the centromere towards opposite poles of cell) </span>
<span>Telophase (nuclear envelope forms around each chromosome set)</span>
I am not sure but I am guessing carbon and nitrogen :)
