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It depends what you mean by animals. If you're are talking solely about vertebrates (having a backbone like humans, mammals, fish and others) then the answer is not much. Bacteria produce a lot of carbon dioxide. Plus Carbon Dioxide is released naturally through volcanic activity. Plants would still have plenty of CO2 to continue breathing.

On the other hand, if all forms of life that used oxygen to breathe were to suddenly vanish, they is a very good chance that most plants would cease to function as they wouldn't have enough CO2 to breathe.
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13y ago

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