All the words that tends to make it sound like an argumentative essay. So basically, when you talk about a narrative essay it should be written in an organized way with the goal of just telling a story and not trying to be persuasive. First pronouns should be used.
Answer: Nombre de la enfermedad.
Imagen
Definición de cada enfermedad
Causa de la en
Explanation:
They both mean wait, and because they both end in "yo" I believe they are both formal.