My tree as a center made up a small biosphere. There are some organisms and animal in the small biosphere. such as, bacterium, virus, birds, edc. It is because they have different function to improve environmental sustainability. The birds produce debris can supply my tree fertilizer. Bacteria can decompose these fertilizers, the tree can better absorption of these fertilizers. So, all of them have a different function to improve environmental sustainability. If in the environment just have my tree, I think that my tree will be died soon.
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