Allusion is the type of figurative language used here, I believe.
The main idea is about Dolphins. The 2 key details are how they take care of there babies and about their teeth.
An officer (police officer) is someone who fights against crime, and helps prevent it from happening. A criminal starts crime, and causes trouble for the police officers.
Area in Math is what is inside of an outline/shape. For example, if you are given an outline of a rectangle, you can calculate the area by multiplying one short side with one long side. The total number gives you the amount of space inside the rectangle.
I hope this helped!
