Comment by fluoridation

It's not the same thing. A language is a closed system, it just requires that the participants agree on the rules in order to be successful. Biology is not a language, it's a field of study of phenomena that exist independently of minds. If you read a biology textbook (or an LLM's output about biology) and then relate to someone else what you've read, you and the other person can discuss the topic, and be no closer to ascertain whether what you two understand has any basis in reality.