It produces new cells to carry oxygen. It produces chemicals to regulate growth. It produces antibodies to fight bacteria. It produces electrical signals to control the body.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A science teacher is discussing the immune system with his class. Which statement should the teacher make about this system?
Possibilities:
- It produces new cells to carry oxygen.
- It produces chemicals to regulate growth.
- It produces antibodies to fight bacteria.
- It produces electrical signals to control the body.

It produces antibodies to fight bacteria.