the main idea of a paragraph is, "teeth can tell you what types of food an animal eats."

which of the following is a detail that supports the main idea?

you can also tell what an animal eats by examining its den.

animals that are meat eaters (carnivores) have canine teeth for cutting and tearing.

mammals have teeth; insects do not.

if you don't brush a dog's teeth regularly, it can lead to decay.