How does the interaction between Claudette and
Jeanette on pages 243-244 develop each character?

because each is self-sufficient.  

the answer is: round.

in literature, round characters are considerably complex and experience or are subjected to unpleasant situations. as a consequence, they go through crucial sentimental and psychological development, which can cause surprise in the readers. in this case, juan's dramatic transformation is related to the adversities he meets at school.

sorry answered wrong answer

there is no excerpt.

put the excerpt in the comments and ill answer.