Choose the Correct Answer from the List Below

Choose the correct answer from the list below. Not all of the answers will be used.
-____________: The molecule whose function is to facilitate diffusion of oxygen in muscle cells.

A) cooperative
B) oxygen
C) fMRI
D) carbamate
E) histidine
F) hyperbolic
G) myoglobin
H) bicarbonate ion
I) sickle-cell anemia
J) protoporphyrin
K) fetal
L) carbonic acid