I think the answer is D but it's been a while since I've done this.
The Answer is the Intertidal Zone
Answer:
it orbits the Earths atmosphere
Explanation:
When you are sick your muscles shut down and you skeletal system helps keep you from turning into a blob.
I believe it is the "myelin sheath." White matter = myelinated (has myelin sheath), while gray matter = unmyelinated (no myelin sheath)!
