Line three exemplifies the use of Simile. A simile draws a comparison between two things that are unrelated, usually using the word "like" or "as". Here, the speaker compares him or herself (a human) to a "noble amphibian" by using the word "like".
The word 'mother' should be capitalised in place of someone's name. However, since you have already mentioned that she is called 'Sonya', the word 'mother' should not be capitalised.
The answer is give the letter to whoever answers the bell.