Assuming we're just looking at this phrase, "learn'd" suggests that the astronomer studied to become intelligent in the astronomical field.
Life is a highway by rascal flatts
Affixes can be prefix or suffix which are added to the root word to give another meaning to the base word. In this case, we are given the word polymorphous which means passing through many phases. Base word is morph. one affix is poly which means many while -ous is related to characterization Sorry its so lone I just LOVE this subject if there are any more ? you need me to awnser ill be MORE THAN FREKING HAPPY TO FOR NO POINTS xD :)
Answer:
read then watch and write a list of what the characters are know for, what they have in common and why they're so diffrent. that should get you comfortable with how the character is.