Question

1. which is the main function of the respiratory system? to help oxygen get into blood vessels to protect the body from illness to protect the internal organs to push blood to all parts of the body

Explanation:

The respiratory system's core role is gas exchange: it takes in oxygen, which diffuses into blood vessels, and removes carbon dioxide from the blood. The other options describe functions of other body systems: protecting from illness is the immune system's role, protecting internal organs is the skeletal system's role, and pumping blood is the circulatory system's role.

Answer:

to help oxygen get into blood vessels