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nitrification 的热门建议

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The Nitrogen Cycle!
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YouTubeBioMan Biology
The Nitrogen Cycle!
Transcript: Because the earth is finite, matter has to be reused and recycled over and over again. So, the atoms that are in you, were once in the air, in soil, in water, and in rocks. These atoms have also been used by countless other living things, from dinosaurs, to broccoli plants, to Abraham Lincoln. And after they leave you, they will ...
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