The fatty substance that insulates and protects the axon is myelin sheath. That is option D.
<h3>The nerve cells (neuron)</h3>
The nervous system is made up of nerve cells that helps to send and receive signals that are interpreted by the brain.
The parts of the nerve cell include the following:
The axon is part of the nerve cell that transmits electrical signals. it is surrounded by myelin sheath.
The myelin sheath is a fatty layer that insulates the axon and helps it transmit signals over long distances.
Therefore, the fatty substance that insulates and protects the axon is myelin sheath.
Learn more about neurons here:
brainly.com/question/13061744
C. The size of the tumor before because it doesn't depend on Drug X's effects or the effects/changes from the scientist.
PH 3 is the most acidic while pH 5 is the most acidic.
Flatworm get most of their oxygen through diffusion.
