Answer:
The Immortals also known as the Persian Immortals was the name given by Herodotus to an elite heavily-armed infantry unit of 10,000 soldiers in the army of the Achaemenid Empire. This force performed the dual roles of both Imperial Guard and standing army. Wikipedia
Amino acids, and proteins. Hope this helps! :)
Domesticating animals learned it freshman year
I believe the answer is: the suggestibility of the individual who is to be hypnotized
Suggestibility in this context refers to the inclination of the person to accept the act of hypnosis that being done to that person. This would make them much more open to follow the instruction given during the hypnosis, which most likely lead to higher chance of success.