Trees don't breathe in the same way that humans do. They don't take in oxygen and breathe out carbon dioxide. Instead, they use a process called photosynthesis.

Here's how it works:

* Trees take in carbon dioxide and water.

* They use sunlight as energy.

* They combine these ingredients to make sugar (glucose) for food.

* As a byproduct, they release oxygen.

So, trees actually make oxygen when they "breathe".