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the process of change of gases from plants and animals known RESPIRATION . plants have small pores named stomata in the transversal part of leaf where  as animal have lungs for this process
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Animals breath in fresh air, extract oxygen and leave a warmer CO2 into the air as waste. In using the energy in carbon atoms, our body mixes oxygen with carbon and releases them as  CO2. CO2 is easily released from cells and organism.

Plants use CO2 gas in the process of photosynthesis and exhale the oxygen gas as waste. During the photosynthesis sunlight energy is stored in the carbon atoms.
Plant respiration is limited due to diffusion process : absorption of CO2 from atmosphere by the holes (stoma) under the leaves.

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