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Role of trees in our ecosystem is very animals and plant lives are inter related.animals release carbon dioxide which is absorbed by plants.if any animal die in forest its fossil will be converted to humus of the soil.plants can further live without animals but animals are depended on plants.plants helps to decrease the temperature of the earth by absorbing carbon dioxide.plants also provide many useful things.
during the day time the plants prepare food by photosynthesis which requires carbon dioxide.trees take in carbon dioxide which is given by humans.plants release oxygen and help to maintain the percent of carbon dioxide in the atmosphere.