Respuesta :
-first when he learned punctuation he wanted to correct his mistakes
- second he improved his mistakes that is he improved his spellings
That's all
- second he improved his mistakes that is he improved his spellings
That's all
The details that showed that Charlie's intelligence was increasing are:
- He says he has learned punctuation.
- His spelling has improved.
- He does not race Algernon any more.
How did we know Charlie was getting more intelligent?
He had improved his punctuation and spelling such that he was able to see the mistakes he made in the past and wanted to fix them.
He also realized that there was no need to race with Algernon and he could just play with him instead.
In conclusion, these three signs showed Charlie was getting more intelligent.
Find out more on Charlie intelligence at https://brainly.com/question/15725180.