produce hormones that regulate body functions form chemicals that destroy microbes break down food to release nutrients supply red blood cells to carry oxygen
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The primary role of the endocrine system is to
Possibilities:
- produce hormones that regulate body functions
- form chemicals that destroy microbes
- break down food to release nutrients
- supply red blood cells to carry oxygen

produce hormones that regulate body functions