THIS USER ASKED πŸ‘‡

Which protein serves as a chemical messenger? a. hemoglobin b. actin c. myosin d. insulin

THIS IS THE BEST ANSWER πŸ‘‡

I would also agree that insulin is the answer

insulin is called endocrine insulin. Hormones are produced by the endocrine glands. Insulin is a protein made by the beta cells, which is found in the pancreas. The main function of beta cells is to store and then release insulin.

I hope this helped and good luck to you. If you need to clarify anything please let me know.