Margaret wants to create a comparison for hormones to help her understand their function better. Which of the comparisons below is the best?

Hormones carry messages from glands to particular cells, telling those cells what to do. This is most like an e-mail carrying instructions from a boss to an employee. A key-and-lock comparison more closely describes how a hormone fits a specific receptor, not the hormone’s overall function as a messenger.

AI-written and checked against the verified answer.