Question

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

Explanation:

The respiratory system's main role is gas - exchange, allowing oxygen to enter the bloodstream and carbon - dioxide to be expelled. Protecting internal organs is a function of the skeletal and muscular systems, and pushing blood is the heart's job.

Answer:

to help oxygen get into blood vessels