Which figure of speech is involved when jem remembers that mrs dubose's mouth moved out and in like a clam hole at low tide?

Answer 1

First of all it is Jean Louise that recalls and secondly I believe it is a simile because it uses like.

Answer 2

This is a simile, comparing Mrs. Dubose's mouth movement to a clam hole at low tide. A simile uses "like" or "as" to make a comparison between two different things to help create a vivid image in the reader's mind.