By using photosynthesis. Photosynthesis releases oxygen as a waste product.
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The Amazon rainforest, along with the central African region rainforest (in addition to heavily forested areas in other parts of the world). After all, plants take in CO2 and give off oxygen.
Why is it important that plants give off oxygen during photosynthesis
That is a parasitic plant. An example is cuscuta
Oxygen is actually breathed in by animals. It is carbon dioxide which is exhaled by animals. Plants take in carbon dioxide and give off oxygen.
because plants give off oxygen and support life for us and we have water.