How do trees produce oxygen?
user
Can you explain what you want to know?
assistant
I want to know how trees give oxygen to earth
user
Oxygen comes from the atmosphere, and trees are the primary producer of it.
assistant
How do they produce it
user
They produce it through photosynthesis.  Photosynthesis is the process by which plants convert carbon dioxide and water into sugars, releasing oxygen as a byproduct.
assistant
How do trees produce oxygen?
user
Can you explain what you want to know?
assistant
I want to know how trees give oxygen to earth
user
Oxygen comes from the atmosphere, and trees are the primary producer of it.
assistant
How do they produce it
user
The water in the air splits up into hydrogen and oxygen when it is exposed to sunlight.  The oxygen then reacts with carbon in the photosynthesizing cells of the tree.
assistant
How do trees produce oxygen?