We can breathe in and out of our mouth.  We take in air through our mouth.  It goes to our lungs.  We then breathe our of our mouth.  Breathing brings oxygen to our body!

Our lungs are inside our body.  Our lungs help bring oxygen to the rest of our body.

Air is all around us.  Air has oxygen in it.  Our bodies need oxygen!

Air has oxygen in it.  We take in oxygen to our bodies when we breathe!

We breathe out carbon dioxide.  Carbon dioxide is a gas.  Carbon dioxide is waste for humans.  Plants need carbon dioxide to live.