True, the narrator can be all of those things. Some examples include the following:
Major Character who's the narrator: Hazel Grace Lancaster in The Fault in Our Stars
Minor Character who's the narrator: Nick Carraway in The Great Gatsby
Protagonist: Esther in Sylvia Plath's The Bell Jar (narrated in 1st Person POV)
Antagonist: Amy Dunne in Gone Girl by Gillian Flynn
Shelly felt (worst) than Jane after they both got the flu.
Adverb Comparative Superlative
badly worse worst
Hope this helps.
When your broke and need money
Answer:
Protein is good for body because it can help body to grow healthy.
and how it can help us stay concentrated is went we healthy and don't have any ill we will stay concentrated.