There is only one answer but what is the answer.
The correct answer is the Nervous system and the Endocrine system. These two systems control all other systems and by doing it create homeostasis in the body.
I think it may be “one is much longer and complex than the other”
Looks Good. I Would Check Your Punctuation And Spelling Once More. I Would Also Include What You Like About Their Food/Company, Because They Won't Hire You If All You Talk About Is How Their Food Sucks, And Why They Should Hire You, Because They Won't Want To Hire Someone Who Always Criticizes Their Product. Include Some Good, And Some Bad. other Than That, Looks Really Good! Great Job!