The various planets are thought to have formed from the solar nebula, the disc-shaped cloud of gas and dust left over from the Sun's formation.
The myelin sheath covers most of the axon. It is important because it helps to protect the axon and speed up the neuron firing process by decreasing the amount of time in the axon.
Why does the author put that there?
How are theses text features useful in my reading?
Answer:
c
Explanation:
act as carrier molecules for various solutes
