Plants and Gases

What is a gas?

You cannot see gas.

A gas can fill up a tire, a bubble, or a ballon.

Air is a gas.  Air has oxygen in it.

People breathe in oxygen.

Carbon dioxide is a gas.

People breath out carbon dioxide.

People breathe in oxygen.

People breathe out carbon dioxide.

Plants do the opposite!

Plants give out oxygen.

Plants take in carbon dioxide.

People and plants help each other by giving out what the other one needs!