Although no words are underlined in this question, the word that is misspelled is "responsable," which should read "responsible." Spelling mistakes are very easy to make, and they are some of the most common mistakes that students make when writing essays. However, a way to improve this is by having a dictionary close by whenever we write, and using it whenever we are in doubt about the correct spelling of a word.
Chiron, in Greek mythology, one of the Centaurs. Chiron lived at the foot of Mount Pelion in Thessaly. Unlike other Centaurs, who were violent and savage, he was famous for his wisdom and knowledge of medicine.