False. It would be similar triangles not congruent.
It shows how humans have threatened the life of reptiles while they have lived, by also giving an example of turtles being stuck in the nets. That makes the passage more dramatic and gives the reader an effect of shame, and has left an impact/influence.
Onomatopoeia is literary device that copies natural sounds.
A simile is a comparison between two things using as or like.
Metaphor is a direct comparison between two things without the use of ‘as’ or ‘like’