The Tharsis bulge is probably a plume of molten mantle material that rose to Mars' surface and formed the said bulge, a rounded projection. It is also the biggest bulge with solid surfaces among all the planets known.
Someone asked this question already and it was answered by @mrsbabyjacob and verified by an expert. Here’s there answer:
“Relaxation occurs when stimulation of the nerve stops. Calcium is then pumped back into the sarcoplasmic reticulum breaking the link between actin and myosin. Actin and myosin returned to their unbound state causing the muscle to relax.”
Another person said they thought the answer was A.
Just don’t want you to accidentally waste your points when there are answers already :)
