Cedar Tree
The trunk of a large cedar tree. It breathes air in and out of the many cracks in its bark. We live by breathing the oxygen in the air. This oxygen was made inside the flowers and trees, and breathed out by them. If all flowers and trees were to dry up and die, there would be no more oxygen and all living things would die. That is why flowers and trees are so important to us.
All living thing, including plants, breath in carbon dioxide. The combination of this gas, along with water and the energy of sunlight, allow plants to manufacture their own nutrients by a process that is called photosynthesis. Oxygen is released as a result of this process. At other times, the plants breathe in oxygen and release carbon dioxide the way humans do. These gases pass not only through the stoma found in a plant's leaves, but also through pores in the branches' and trunks of trees.
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