The best and most correct answer among the choices provided by your question is the second choice or letter B.
Reptiles don't sit on their eggs like birds do because r<span>eptile eggs are not amniotic and have no shell, so sitting on them would crush them.</span>
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Myelin sheaths, which cover the axon of the nerve cells in the brain and spinal
cord, prevents the electric current from dissipating from the axon.
Destroying the <span>myelin sheaths impairs the
conduction of signals on the affected nerves, causing damage in
every function that the nerve is involved, in this case will affect movements and vision.</span>
A relatively constant internal physical and chemical conditions that organisms maintain.