Trees help us breathe because they produce oxygen as a byproduct of photosynthesis. Here's how it works:

* Photosynthesis: Trees, like all plants, use sunlight, water, and carbon dioxide to create their own food (sugar) through photosynthesis.

* Oxygen Production: During this process, they release oxygen as a waste product into the atmosphere.

* Breathing: We, as humans, breathe in oxygen and exhale carbon dioxide. This carbon dioxide is then used by trees for photosynthesis, completing the cycle.

So, trees essentially "clean" the air by removing carbon dioxide and releasing oxygen, which is essential for our survival.