What are these?
lungs
What are these?
lungs
breathe in or breathe out?
breathe out
What is this?
nose
What system is this?
Respiratory System
What is this?
nose
breathe in or breathe out?
breathe in
What is this?
windpipe
breathe in or breathe out?
breathe out
breathe in or breathe out?
breathe in
What is this?
windpipe
What system is this?
Respiratory System