Given a statement and question, generate the answer to the question such that the answer is contained in the statement.

statement: An animal with an additional joint in its mandible became more mammal-like as it continued to evolve, question: What did an animal with a joint in its mandible become?
mammal

statement: Frogs croak to alert other frogs that is their territory, question: Frogs croak to do what to other frogs?
alert other frogs

statement: bears are related to marine mammals., question: What are bears related to?

marine mammals