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i think the soil and the roots

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I think that it comes form the airs carbon

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I think trees get there mass from thee roots getting nutrient form the soil and energy from the sun

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I would guess that the trees would get their mass from the roots stuck in the ground. So the roots might take soil from the ground. Plus one more thing the sun.

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their roots and the soil

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their roots that are stuck in the ground

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their roots that are stuck in the ground

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give them mass

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I think the roots help give them their mass

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their roots absorb nutrients from the soil and the sun

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I think the soil or roots.

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I have no idea, but my guess would be the sun because plants get their energy from the sun for photosynthesis. Also probably soil and water and other abiotic things. Also, carbon dioxide is involved with photosynthesis, so carbon dioxide probably has something to do with it.

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their roots