The correct answer is "grammar"
Linguist is a person who studies languages, semantics is the science of word and sentence meaning, and arbitrary means that something is subjected to individual will or judgement.
Answer:
Salmon.
Explanation: Helped my brother with this question he got it right.
I believe it was the Nurse.
Answer:
Shrek is strong and optimistic because he thinks that he is the best in all the swamp.
Explanation:
Hope this works!